Release Note for systems built with IBM Storage Virtualize

This is the release note for the 9.1.0 release and details the issues resolved between 9.1.0.0 and 9.1.0.2. This document will be updated with additional information whenever a PTF is released.

This document was last updated on 10 December 2025.

What's new in 9.1.0
Known Issues and Restrictions
Issues Resolved
1. Security Issues Resolved
2. APARs Resolved
Useful Links

Note. Detailed build version numbers are included in the Concurrent Compatibility and Code Cross Reference in the Useful Links section.

1. What's new in 9.1.0

The following new features and enhancements have been introduced in the 9.1.0.0 release:

Increase the number of members in a FlashSystem grid to 32.
AI-based target system recommendations added for storage partition migration through integration with IBM Storage Insights.
Move volumes between volume groups in the same storage partition.
Host cluster management in storage partitions.
Rename volumes, volume groups, hosts, host clusters and storage partitions that are configured for replication or high availability.
Increase the number of storage partitions to 32.
Optional assignment of an IP address to a storage partition which will be active on the management system for a partition.
Link a storage partition to vCenter for an improved management experience for VMFS and vVol environments.

vVol environments will be migrated to using storage partitions as part of the upgrade process. Additional steps may be required after the upgrade to complete the migration..

Expand highly available and replicated volumes with automatic expansion on all systems.
Policy-based replication recovery volumes in storage partitions will now be online and read-only if there is a valid recovery point.
Restore a snapshot of a thin-clone to the parent volume or volume group.
Optional buffer size and warning thresholds for provisioning policies.
Address volumes by UUID on the CLI and REST API.
SFTP support to transfer files to and from the system.
Automatic update of FlashCore Modules (FCM) as part of the system update process.
Allow many day-to-day tasks to be run during a system update.
Use case specific SSL certificate support added for key management and internal system to system communication.

The following features were first introduced in Non-LTS release 8.7.3:

FlashSystem grid dashboard for visualization and monitoring on all systems in the grid.
Enhancements to storage partition migration for non-disruptive data movement between systems, including:

GUI support for initiating, monitoring and managing partition migration.
Support for partition migration with disaster recovery.
Partition migration while managing snapshots and Safeguarded Copies.

SCSI Persistent Reserve support for iSCSI hosts in partitions.
Support for highly available snapshots, including snapshot restore without loss of HA.
Enhancements for monitoring high availability and disaster recovery, showing progress and estimated completion time for volume group and partition synchronization.

The following features were first introduced in Non-LTS release 8.7.2:

Support for iSCSI hosts in HA partitions.
Support for SCSI Persistent Reservations for volumes in storage partitions.
Support for internal key management for encrypted data-at-rest.
Single point of administration for health reporting for objects in a FlashSystem grid.
Support for more than 16 NVMe over Fibre Channel hosts.
Policy-based replication can be configured on image mode volumes to allow for a migration from external storage, while maintaining any existing replication on the virtualized storage during the migration.
Volumes or volume groups that are replicated or in highly available storage partitions can be restored or refreshed from a snapshot.
Improvements for better granularity for iSCSI 2-way CHAP authentication and FIPS compliance for iSCSI hosts.
Support for VLAN tagging on management networks for Service IP addresses.
Support for creating a standard child pool in a standard parent pool without specifying a quota.
Host offline alerts can be enabled or disabled on a per-host basis.
Enhancements for Ransomware Threat Detection by introducing volume group awareness for systems with IBM FlashCore Module (FCM4) firmware 4.2 or later.

The following features were first introduced in Non-LTS release 8.7.1:

Policy-based replication can be enabled on volume groups within a highly available storage partition to configure a 3-site solution that delivers a high-performance, easy to use HA plus disaster recovery solution with no single point of failure.

The following features are no longer supported on 8.7.1.0 and later:

Remote Copy; this includes Metro Mirror, Global Mirror, HyperSwap and Volume Mobility.
- These features have been superseded by Policy-based replication and Policy-based HA. Systems using Remote Copy cannot upgrade to 8.7.1.
- Replication capabilities are removed from the FlashSystem 5015 and FlashSystem 5035 as these do not support Policy-based replication or Policy-based High Availability.
Multiple I/O groups:
- FlashSystem grid is the new way to scale-out systems. FlashSystem with multiple I/O groups cannot upgrade to 8.7.1 or later.
- SAN Volume Controller does allow multiple I/O groups to be configured at 9.1.0, and supports upgrade from previous versions in this configuration.
Ethernet-based clustering
iSER host attach
Nondistributed RAID

2. Known Issues and Restrictions

Note: For clarity, the terms "node" and "canister" are used interchangeably.

Details	Introduced
Systems running 9.1.0.x and 9.1.1.x require port 8443 to be opened between partnered systems when setting up partnerships for policy-based replication (asynchronous or high-availability) or partition migration. This port needs to be opened in addition to the ports described in the Product documentation here This issue will be fixed in a future PTF under SVAPAR-184208.	9.1.0.0
When creating a pool in the GUI, the option for a Data Reduction Pool is no longer shown by default. If required, this can be enabled by checking Settings: → GUI Preferences → Advanced Pool Settings.	8.7.3.0
The following restrictions were valid but have now been lifted
A node could go offline with node error 566, due to excessive logging related to DIMM errors. This restriction has been lifted by SVAPAR-176238.	9.1.0.0
Multiple node warmstarts could cause loss of access to data after upgrade to 8.7.2 or later, on a system that was once an AuxFar site in a 3-site replication configuration. This was due to invalid FlashCopy configuration state after removal of 3-site replication with HyperSwap or Metro Mirror, and did not apply to 3-site policy-based replication. This restriction has been lifted by SVAPAR-175807.	9.1.0.0
Upgrade from 9.1.0.0 or 9.1.0.1, to 9.1.1.0 or later, was not supported if host clusters existed, or a partition was associated with a management portset. This restriction has been lifted by SVAPAR-183577.	9.1.0.0
On FS5015 and FS5035 running 9.1.0.0 and 9.1.0.1, volumes could not be expanded using the GUI or the 'chvolume -size' CLI command. This restriction has been lifted by SVAPAR-179296.	9.1.0.0
IBM SAN Volume Controller Systems with multiple I/O groups were not supported. This restriction has been lifted for long-term support release 9.1.0.	8.7.1.0

3. Issues Resolved

This release contains all of the fixes included in the 8.7.0.6 release, plus the following additional fixes.

A release may contain fixes for security issues, fixes for APARs or both. Consult both tables below to understand the complete set of fixes included in the release.

3.1 Security Issues Resolved

Security issues are documented using a reference number provided by "Common Vulnerabilities and Exposures" (CVE).

CVE Identifier	Link for additional Information	Resolved in
CVE-2025-47268	7250955	9.1.0.2
CVE-2025-4373	7250955	9.1.0.2
CVE-2024-12133	7250955	9.1.0.2
CVE-2025-48964	7250955	9.1.0.2
CVE-2024-12243	7250955	9.1.0.2
CVE-2025-32988	7250963	9.1.0.2
CVE-2025-32989	7250963	9.1.0.2
CVE-2025-36118	7250954	9.1.0.2

3.2 APARs Resolved

Show details for all APARs

APAR

Affected Products

Severity

Description

Resolved in

Feature Tags

SVAPAR-181640

All

After expanding a volume that is being asynchronously replicated, data written to the recently expanded region of the disk may not get replicated to the remote site if the replication is running in low bandwidth mode. This can lead to an undetected data loss at the DR site. (show details)

Symptom	Data Integrity Loss
Environment	Systems using asynchronous PBR
Trigger	Expansion of a volume that is performing asynchronous replication
Workaround	None

9.1.0.2

Policy-based Replication

SVAPAR-173858

All

Expanding a production volume that is using asynchronous replication may trigger multiple node warmstarts and an outage on the recovery system. (show details)

Symptom	Loss of Access to Data
Environment	System running software version 9.1.0 and using an asynchronous disaster recovery replication policy.
Trigger	Expanding a volume in a volume group with an asynchronous disaster recovery replication policy.
Workaround	None

9.1.0.2

Policy-based Replication

SVAPAR-173936

All

A timing window can lead to a resource leak in the thin-provisioning component. This can lead to higher volume response times, and eventually a node warmstart caused by an I/O timeout. (show details)

Symptom	Performance
Environment	Systems using thin-provisioned volumes.
Trigger	None
Workaround	Warmstarting the affected node will clear the issue.

9.1.0.2

Thin Provisioning

SVAPAR-175807

All

Multiple node warmstarts may cause loss of access to data after upgrade to 8.7.2 or later, on a system that was once an AuxFar site in a 3-site replication configuration. This is due to invalid FlashCopy configuration state after removal of 3-site replication with HyperSwap or Metro Mirror, and does not apply to 3-site policy-based replication. (show details)

Symptom	Loss of Access to Data
Environment	Any system that was previously an AuxFar site in a 3-site replication configuration.
Trigger	None
Workaround	None

9.1.0.2

3-Site using HyperSwap or Metro Mirror

SVAPAR-176238

All

A node may go offline with node error 566, due to excessive logging related to DIMM errors. (show details)

Symptom	Loss of Redundancy
Environment	Systems running 9.1.0 software
Trigger	Logging of correctable DIMM errors
Workaround	None

9.1.0.2

Reliability Availability Serviceability

SVAPAR-177639

All

Deletion of volumes in 3-site (HA+DR) replication may cause multiple node warmstarts. This can only occur if the volume previously used 2-site asynchronous replication, and was then converted to 3-site (HA+DR). (show details)

Symptom	Loss of Access to Data
Environment	FlashSystem 7300 and C200 systems using 3-site replication
Trigger	Deletion of a volume that previously used 2-site asynchronous replication
Workaround	None

9.1.0.2

Policy-based High availability, Policy-based Replication

SVAPAR-178250

All

Node warmstarts may be triggered by a race condition during NVMe host reset, if the host is using Compare and Write commands. This can cause a loss of access to data. (show details)

Symptom	Loss of Access to Data
Environment	Systems using NVMe hosts
Trigger	None
Workaround	None

9.1.0.2

NVMe Hosts

SVAPAR-178402

All

Multiple node warmstarts may occur when there are a high number of errors on the fibre channel network. (show details)

Symptom	Multiple Node Warmstarts
Environment	All systems using fibre channel connectivity.
Trigger	A high number errors on the fibre channel network.
Workaround	None

9.1.0.2

Fibre Channel

SVAPAR-179030

All

The CIMOM configuration interface is no longer supported in 9.1.0. Attempting to manually restart the cimserver service may cause a node warmstart, and loss of configuration access. (show details)

Symptom	Configuration
Environment	Systems running 9.1.0
Trigger	Attempting to restart the cimserver service
Workaround	None

9.1.0.2

Command Line Interface

SVAPAR-179930

All

Node warmstarts when backend IO is active on a fibre channel login that experiences a logout on code level 9.1.0.0 or 9.1.0.1. (show details)

Symptom	Multiple Node Warmstarts
Environment	Fibre channel logins between nodes and backend storage or fibre channel logins between nodes. Code level 9.1.0.0 or 9.1.0.1.
Trigger	None
Workaround	None

9.1.0.2

Backend Storage, Fibre Channel

SVAPAR-180838

All

Multiple node warmstarts on systems running 9.1 if High Availability (PBHA) is added to an existing asynchronous replication (PBR) setup and the volumes are using persistent reserves. (show details)

Symptom	Multiple Node Warmstarts
Environment	3-Site Replication (PBHA + PBR DR) on Systems running 9.1
Trigger	Adding Policy based High Availability to an existing asynchronous replication configuration. This includes using HA to migrate a volume to another FlashSystem
Workaround	None

9.1.0.2

Policy-based High availability, Policy-based Replication

SVAPAR-169255

All

High peak response times when adding snapshots for a volume group containing mirrored vdisks. (show details)

Symptom	Performance
Environment	Stretched cluster/mirrored vdisks and the volume group snapshot feature.
Trigger	Add a snapshot for a volume group containing mirrored vdisks.
Workaround	None

9.1.0.2

Performance, Snapshots, Volume Mirroring

SVAPAR-177127

All

The system may fail to install an externally signed system certificate via the GUI. (show details)

Symptom	Configuration
Environment	All systems using system software version 9.1.0.0 or later
Trigger	Installing an externally signed system certificate.
Workaround	Use the CLI to install the certificate.

9.1.0.2

Encryption, Graphical User Interface

SVAPAR-178258 & SVAPAR-178262

All

System may experience performance issue when configured with ISCSI host (show details)

Symptom	Performance
Environment	System using ISCSI Hosts.
Trigger	None
Workaround	None

9.1.0.2

Performance, iSCSI

SVAPAR-179128

All

A single-node warmstart may occur on a system using policy-based replication or HA, due to a timing window triggered by disconnection of a partnership. (show details)

Symptom	Single Node Warmstart
Environment	Systems using policy-based replication or policy-based High Availability
Trigger	Disconnection of a partnership while messages are in flight between the two systems
Workaround	None

9.1.0.2

Policy-based Replication

SVAPAR-179296

FS5000

In 9.1.0.0 and 9.1.0.1, the "chvolume -size" command has no effect on FS5015 and FS5035. This prevents GUI volume resizing from working correctly. (show details)

Symptom	Configuration
Environment	IBM Storage FlashSystem 5015 and 5035.
Trigger	Resizing a volume using the "chvolume -size" CLI command or the GUI
Workaround	Use the expandvdisksize command to expand the provisioned capacity of a volume by a specified amount.

9.1.0.2

SVAPAR-181556

All

Configuration backups and support data collection (snap) can fail on systems running 9.1 if there are any invalid UTF-8 characters in the login banner (show details)

Symptom	Configuration
Environment	Systems with a login banner configured
Trigger	None
Workaround	Re-configure the banner to use valid UTF-8 characters

9.1.0.2

Reliability Availability Serviceability

SVAPAR-182188

All

A single node warmstart may occur when the Ransomware Threat Detection process stops functioning (show details)

Symptom	Single Node Warmstart
Environment	Systems using Ransomware Threat Detection
Trigger	None
Workaround	None

9.1.0.2

Reliability Availability Serviceability

SVAPAR-182909

All

FlashSystem CLI, GUI and REST API are inaccessible on releases 9.1.0.0 and 9.1.0.1 (show details)

Symptom	Configuration
Environment	Code level 9.1.0.0/9.1.01 with Policy-based High Availability and Highly Available snapshots configured.
Trigger	The creation of a highly available snapshot
Workaround	Warmstart the config node.

9.1.0.2

Command Line Interface, Graphical User Interface, Policy-based High availability, REST API

SVAPAR-139491

All

VMWare hosts attached via NVMe may log errors related to opcode 0x5 (show details)

Symptom	Configuration
Environment	Systems with NVMe hosts.
Trigger	None.
Workaround	None.

9.1.0.2

NVMe

SVAPAR-170958

All

Policy-based asynchronous replication may not correctly balance the available bandwidth between nodes after a node goes offline, potentially causing a degradation of the recovery point (show details)

Symptom	Performance
Environment	Systems using asynchronous policy-based replication
Trigger	Node goes offline
Workaround	Warmstart affected nodes

9.1.0.2

Policy-based Replication

SVAPAR-173310

All

If both nodes in an IO Group go down unexpectedly, invalid snapshots may remain in the system which cannot be removed (show details)

Symptom	Configuration
Environment	Systems using volume group snapshots.
Trigger	Both nodes in an IO Group go down unexpectedly.
Workaround	None.

9.1.0.2

Snapshots

SVAPAR-175855

All

A new volume may incorrectly show a source_volume_name and source_volume_id, when it inherits the vdisk ID of a deleted clone volume. (show details)

Symptom	Configuration
Environment	Systems using volume group snapshots and clones
Trigger	Create a snapshot of a VG. Create a clone from the snapshot. Delete the clone. Create a new volume.
Workaround	None.

9.1.0.2

Snapshots

SVAPAR-177359

All

Users may need to log out of iSCSI sessions individually, as simultaneous logout is not supported. (show details)

Symptom	None
Environment	iSCSI hosts
Trigger	iSCSI logout processing
Workaround	None

9.1.0.2

iSCSI

SVAPAR-177771

All

Encryption with internal key management may be unable to perform the scheduled daily re-key of the internal key. The event log will show a daily repeating information event when this occurs. The current internal recovery key will continue to function. (show details)

Symptom	Configuration
Environment	Systems using software version 9.1.0.x and encryption with internal key management.
Trigger	A node reboot or warmstart with the affected configuration.
Workaround	None

9.1.0.2

Encryption

SVAPAR-178208

All

A race condition in I/O processing for NVMe over RDMA/TCP hosts may lead to a single node warmstart. (show details)

Symptom	Single Node Warmstart
Environment	Systems with NVMe over RDMA or TCP hosts attached.
Trigger	None
Workaround	None

9.1.0.2

NVMe Hosts

SVAPAR-178320

All

When an invalid subject alternative name is entered for a mksystemcertstore command, the system returns CMMVC5786E The action failed because the cluster is not in a stable state. (show details)

Symptom	Configuration
Environment	All systems at 9.1.0 or higher.
Trigger	Running the mksystemcertstore command with an invalid subject alternative name value.
Workaround	None

9.1.0.2

Encryption

SVAPAR-178323

All

The system may attempt to authenticate a LDAP user who is not in any remote user group with a null password. (show details)

Symptom	Configuration
Environment	Systems using LDAP authentication.
Trigger	Attempting to sign into the system with a user who is not in any remote user group.
Workaround	None

9.1.0.2

LDAP

SVAPAR-179874

All

GUI displays old partition name after renaming. (show details)

Symptom	Configuration
Environment	This affects GUI's volume groups view, which continues to display the previous partition name (for volume groups associated with the renamed partition).
Trigger	Renaming partition
Workaround	None

9.1.0.2

Graphical User Interface

SVAPAR-183577

All

Upgrade from 9.1.0.0 or 9.1.0.1, to 9.1.1.0 or later, is not supported if host clusters exist, or a partition is associated with a management portset. (show details)

Symptom	Configuration
Environment	Systems with host clusters, or partitions with a management portset.
Trigger	Upgrade from 9.1.0.0 or 9.1.0.1, to 9.1.1.0 or later.
Workaround	Upgrade via 9.1.0.2 or a later 9.1.0 PTF.

9.1.0.2

Policy-based High availability

SVAPAR-172745

All

Systems using policy based high availability (PBHA) on 9.1.0.0 may experience a detected data loss after performing configuration changes and multiple failovers of the active management system. (show details)

Symptom	Data Integrity Loss
Environment	Systems running 9.1.0.0 with PBHA configured
Trigger	Failing over the AMS to the other system
Workaround	None

9.1.0.1

Policy-based High availability

SVAPAR-172478

All

Systems running 9.1.0.0 may incorrectly report 1585 "Could not connect to DNS server" errors (show details)

Symptom	Error in Error Log
Environment	System with DNS configured
Trigger	None
Workaround	Register the cluster IP address in all configured DNS servers

9.1.0.1

No Specific Feature

SVAPAR-164082

All

When configuring 3-site replication by adding a policy-based HA copy to an existing volume that already has DR configured, any writes that arrive during a small timing window will not be mirrored to the new HA copy, causing an undetected data corruption. (show details)

Symptom	Data Integrity Loss
Environment	Systems running 8.7.3 and higher
Trigger	Adding a HA copy to an existing volume which is already configured with asynchronous replication
Workaround	None

9.1.0.0

Policy-based High availability, Policy-based Replication

SVAPAR-167865

All

Systems with heavy iSCSI I/O workload may show a decrease in performance after upgrade to 8.7.0 or later (show details)

Symptom	Performance
Environment	Systems with iSCSI hosts
Trigger	Heavy iSCSI host workload
Workaround	None

9.1.0.0

Performance, iSCSI

SVAPAR-170657

FS9500

A problem with NVMe drives on FlashSystem 9500 may impact node to node communication over the PCIe bus. This may lead to a temporary array offline.

SVAPAR-134589 previously addressed the same issue, but that fix was found to be incomplete.

. For more details refer to this Flash (show details)

Symptom	Loss of Access to Data
Environment	No Value
Trigger	NVMe drive failure
Workaround	None

9.1.0.0

Drives

SVAPAR-143997

All

A single node warmstart may occur when the upper cache reaches 100% full while the partner node in the I/O group is offline (show details)

Symptom	Loss of Access to Data
Environment	None
Trigger	Partner node is offline
Workaround	None

9.1.0.0

Reliability Availability Serviceability

SVAPAR-144389

SVC

In an SVC stretched cluster, adding a second vdisk copy to a PBR-enabled volume using the GUI does not automatically add a copy to the change volume. This can cause subsequent vdisk migration requests to fail. (show details)

Symptom	Configuration
Environment	SVC stretched cluster with PBR
Trigger	Adding a vdisk copy to a PBR-enabled volume in an SVC stretched cluster
Workaround	Manually add the copy to the change volume with the CLI command "addvdiskcopy -mdiskgrp <mdiskgrp_id> <change_volume_vdisk_id>". The -rsize parameter is not needed to make the change volume thin-privisioned, as this is implicit for PBR change volumes.

9.1.0.0

Policy-based Replication

SVAPAR-148987

SVC

SVC model SV1 nodes running 8.5.0.13 may be unable to access keys from USB sticks when using USB encryption (show details)

Symptom	Loss of Access to Data
Environment	2145-SV1 or 2147-SV1 nodes running 8.5.0.13 with USB encryption enabled.
Trigger	None
Workaround	Encryption key servers are unaffected by this issue, and can be used instead of USB encryption

9.1.0.0

Encryption

SVAPAR-150198

All

Multiple node warmstarts (causing loss of access to data) may occur on 8.7.1 and 8.7.2 software, when deleting a volume that is in a volume group, and previously received a persistent reservation request. (show details)

Symptom	Loss of Access to Data
Environment	Systems where volumes in a volume group received persistent reservation requests from hosts, while running pre-8.7.1 software.
Trigger	Deletion of a volume that is in a volume group
Workaround	Do not delete any volumes that are inside volume groups prior to upgrading to the fix for this APAR.

9.1.0.0

Policy-based High availability, Policy-based Replication, Snapshots

SVAPAR-150433

All

In certain policy-based 3-site replication configurations, a loss of connectivity between HA systems may cause I/O timeouts and loss of access to data. (show details)

Symptom	Loss of Access to Data
Environment	Policy-based 3-site replication, where HA was added to an existing asynchronous replication configuration. If asynchronous replication was added to an existing HA configuration, the system is not exposed.
Trigger	Loss of connectivity between HA systems.
Workaround	None

9.1.0.0

Policy-based High availability, Policy-based Replication

SVAPAR-150764

All

At 8.7.2.0, loss of access to vVols may occur after node failover if the host rebind operation fails. (show details)

Symptom	Loss of Access to Data
Environment	Systems using vVols with 8.7.2.0
Trigger	Node failover
Workaround	None

9.1.0.0

vVols

SVAPAR-153584

All

A node warmstart may occur when a system using policy-based high availability loses connectivity to the remote system. In rare instances, both nodes in the system can warmstart at the same time. This is due to an inter-node messaging timing window. (show details)

Symptom	Loss of Access to Data
Environment	Policy-based High Availability with 8.7.1 or earlier software
Trigger	Loss of connectivity between PBHA systems
Workaround	None

9.1.0.0

Policy-based High availability

SVAPAR-155395

All

Hardware failure of a node at the exact moment that a volume is being created can result in an invalid cache state. If I/O is received by that volume before the failed node recovers, node warmstarts may cause loss of access to data. (show details)

Symptom	Loss of Access to Data
Environment	None
Trigger	Node hardware failure at the exact time that a volume is being created
Workaround	None

9.1.0.0

Cache

SVAPAR-155437

All

When enabling replication for a volume group, there is a very low probability that the DR system might detect an invalid state, due to a timing window between creation of the volume group and the volumes. If this happens, both nodes at the DR system might warmstart at the same time. (show details)

Symptom	Loss of Access to Data
Environment	None
Trigger	Addition of a replication policy to a volume group
Workaround	None

9.1.0.0

Policy-based Replication

SVAPAR-155656

All

Multiple node asserts when removing a VDisk copy (or adding a copy with the autodelete parameter) from a policy-based replication recovery volume (show details)

Symptom	Multiple Node Warmstarts
Environment	Policy-based replication recovery system
Trigger	Removing a VDisk copy from a replication recovery volume, or adding a copy with the autodelete parameter
Workaround	Do not remove VDisk copies and do not add VDisk copies with the autodelete parameter on replication recovery volumes

9.1.0.0

Policy-based High availability, Policy-based Replication

SVAPAR-155697

All

Loss of access to data caused by a partial failure of an internal PCI express bus (show details)

Symptom	Loss of Access to Data
Environment	None
Trigger	None
Workaround	None

9.1.0.0

Reliability Availability Serviceability

SVAPAR-156976

All

Volumes in a data reduction pool with deduplication enabled may be taken offline due to a metadata inconsistency (show details)

Symptom	Offline Volumes
Environment	Systems using DRP with Deduplication
Trigger	None
Workaround	None

9.1.0.0

Data Reduction Pools

SVAPAR-157355

All

Multiple node warmstarts under very heavy work-loads from NVMe over FC hosts. (show details)

Symptom	Multiple Node Warmstarts
Environment	Systems with NVMe over FC hosts
Trigger	Heavy workloads
Workaround	None

9.1.0.0

NVMe Hosts

SVAPAR-160242

All

If an FCM array is offline due to an out-of-space condition during array expansion, and a T2 recovery takes place, the recovery may fail, resulting in both nodes being offline with node error 564. (show details)

Symptom	Multiple Node Warmstarts
Environment	Systems with FCM arrays
Trigger	T2 recovery
Workaround	None

9.1.0.0

RAID

SVAPAR-161932

All

Creating 20480 thin-provisioned volumes may cause multiple node warmstarts and loss of access to data, due to an invalid internal count of the number of thin-provisioned volumes. (show details)

Symptom	Loss of Access to Data
Environment	Systems using a large number of thin-provisioned volumes
Trigger	None
Workaround	None

9.1.0.0

Thin Provisioning

SVAPAR-162836

All

Node warmstarts when starting a Volume Group Snapshot, if there are multiple legacy FlashCopy maps with the same target volume. (show details)

Symptom	Multiple Node Warmstarts
Environment	Volume Group Snapshots and legacy FlashCopy maps on the volumes
Trigger	If the source vdisks of a legacy flashcopy map is in a volume group, and that fcmap is sharing a target with another legacy fcmap, this can cause a scenario where a timeout can occur and cause the nodes to warmstart.
Workaround	Delete any legacy FlashCopy maps that share a target with another legacy FlashCopy map.

9.1.0.0

FlashCopy, Snapshots

SVAPAR-164206

All

A short loss of access can occur due to a cluster warmstart when deleting a volume with a persistent reservation on systems protected by policy-based high availability. (show details)

Symptom	Multiple Node Warmstarts
Environment	Systems running 8.7.2 or higher and using policy-based high availability.
Trigger	Deletion of a volume which has a persistent reservation
Workaround	None

9.1.0.0

Policy-based High availability

SVAPAR-164430

All

Repeated single node warmstarts may occur in a 3-site policy-based HA+DR configuration, due to a timing window during an HA failover scenario. (show details)

Symptom	Multiple Node Warmstarts
Environment	A policy-based high availability replication with asynchronous disaster recovery (3-site replication).
Trigger	None.
Workaround	Disable the link to the disaster recovery system.

9.1.0.0

Policy-based High availability, Policy-based Replication

SVAPAR-167390

All

A T2 recovery may occur when manually adding a node to the system while an upgrade with the -pause flag is in progress (show details)

Symptom	Loss of Access to Data
Environment	Systems that are in the process of being upgraded with the -pause flag
Trigger	Adding a node to the system
Workaround	Abort the upgrade

9.1.0.0

System Update

SVAPAR-170351

All

A loss of access to data may occur upon an attempt to use 'charraymember' command to replace the drive while its rebuild is in progress. (show details)

Symptom	Loss of Access to Data
Environment	A degraded RAID-6 array with drive undergoing rebuild.
Trigger	Using the charraymember -member X -newdrive Y <Array Name> command on a member drive whose rebuild is in progress.
Workaround	Do not trigger replacement using the charraymember command on a member drive whose rebuild is in progress.

9.1.0.0

RAID

SVAPAR-170429

All

Policy-based replication or HA may suspend after upgrade to 8.7.0.5, due to a change volume on the recovery system being in an invalid state. (show details)

Symptom	None
Environment	Clusters in 8.7.0.5 running PBR
Trigger	None
Workaround	Contact support for assistance with restarting replication.

9.1.0.0

Policy-based Replication

SVAPAR-177508

All

Multiple node warmstarts may occur on systems where a maximum failed login count has been configured. (show details)

Symptom	Loss of Access to Data
Environment	Systems where lssecurity shows maxfailedlogins is greater than 0.
Trigger	None
Workaround	None

9.1.0.0

Command Line Interface

HU00556

FS5000, SVC

A partner node may go offline when a node in the IO group is removed due to a space efficient timing window. (show details)

Symptom	Single Node Warmstart
Environment	When a system is in the process of destaging metadata of a space-efficient VDisk and the owner node stops.
Trigger	Partner node goes offline whilst a node is destaging metadata of a space-efficient VDisk
Workaround	For SVC environments, spare nodes can prevent this issue. For planned node maintenance, workarounds are to to use 'rmnode' to remove the node from the cluster before taking it offline, or use 'movevdisk' to move the preferred node to the partner node for all space-efficient VDisks before taking a node offline

9.1.0.0

Thin Provisioning

HU02293

All

MDisk Groups can go offline due to overall timeout if the backend storage is configured incorrectly after a hot spare node comes online (show details)

Symptom	Offline Volumes
Environment	Environments with hot spare nodes and also have backend storage that is configured incorrectly
Trigger	Hot spare node coming online
Workaround	Correctly map the MDisks to the spare nodes

9.1.0.0

Hot Spare Node

HU02493

SVC

On certain controllers that have more then 511 LUNS configured, then mdisks may go offline (show details)

Symptom	Offline Volumes
Environment	Any system that has more than 511 LUNS
Trigger	More then 511 LUNS
Workaround	This problem can be resolved by reducing the LUN count to 511 or below on any effected controller.

9.1.0.0

Backend Storage

SVAPAR-120649

All

Node warmstart triggered by a small timing window when temporarily pausing IO in response to a configuration change. (show details)

Symptom	Single Node Warmstart
Environment	Systems using RAID arrays
Trigger	None
Workaround	None

9.1.0.0

Distributed RAID, RAID

SVAPAR-137361

All

A battery may incorrectly enter a failed state, if input power is removed within a small timing window (show details)

Symptom	Loss of Redundancy
Environment	None
Trigger	Removal of input power at the same time a battery power test is in progress
Workaround	Unplug the battery from the node canister and leave it unplugged for at least 10 minutes. Then re-install the battery into the canister.

9.1.0.0

Reliability Availability Serviceability

SVAPAR-142940

All

IO processing unnecessarily stalled for several seconds following a node coming online (show details)

Symptom	Performance
Environment	Systems that have performed an NVMe drive firmware upgrade in the past. Systems with a syslog server configured have a larger impact.
Trigger	A node coming online
Workaround	Contact IBM support.

9.1.0.0

Performance

SVAPAR-144069

All

On a system with SAS drives, if a node canister is replaced while an unsupported drive is in the enclosure, all nodes may warmstart simultaneously, causing a loss of access to data. (show details)

Symptom	Multiple Node Warmstarts
Environment	SAS systems with an unsupported drive
Trigger	Node canister replacement
Workaround	Remove the unsupported drive from the enclosure to stabilise the system

9.1.0.0

Drives

SVAPAR-145278

All

Upgrade from 8.7.0 to 8.7.1 may cause an invalid internal state, if policy-based replication is in use. This may lead to node warmstarts on the recovery system, or cause replication to stop. (show details)

Symptom	Multiple Node Warmstarts
Environment	Systems using policy-based replication
Trigger	Upgrade from 8.7.0 to 8.7.1
Workaround	Make all recovery volume groups independent before upgrading from 8.7.0 to 8.7.1.

9.1.0.0

Policy-based Replication

SVAPAR-146097

All

On systems running 8.7.0 or 8.7.1 software with NVMe drives, at times of particularly high workload, there is a low probability of a single-node warmstart.

9.1.0.0

Drives

SVAPAR-147223

All

System does not notify hosts of ALUA changes prior to hot spare node failback. This may prevent host path failover, leading to loss of access to data. (show details)

Symptom	Loss of Access to Data
Environment	Systems with hot spare nodes
Trigger	Hot spare node failback
Workaround	None

9.1.0.0

Hot Spare Node

SVAPAR-147647

All

A 32Gb Fibre Channel adapter may unexpectedly reset, causing a delay in communication via that adapter's ports. (show details)

Symptom	None
Environment	Systems with 32Gb Fibre Channel adapters.
Trigger	None
Workaround	None

9.1.0.0

Fibre Channel

SVAPAR-148251

All

Merging partitions on 8.7.1.0 software may trigger a single-node warmstart. (show details)

Symptom	Single Node Warmstart
Environment	Systems running 8.7.1.0 software with partitions
Trigger	Partition merge
Workaround	None

9.1.0.0

Policy-based High availability

SVAPAR-150663

All

Some FCM3 drives may go offline on upgrade to 8.7.2.0. (show details)

Symptom	Loss of Redundancy
Environment	Systems with FCM3 product ID 101406B2 or 101406B3
Trigger	Upgrade to 8.7.2.0
Workaround	No Value

9.1.0.0

Drives

SVAPAR-152902

All

If a system is using asynchronous policy-based replication, certain unusual host I/O workloads can cause an I/O timeout to be incorrectly detected, triggering node warmstarts at the recovery site. (show details)

Symptom	Multiple Node Warmstarts
Environment	Systems using policy-based replication
Trigger	None
Workaround	None

9.1.0.0

Policy-based Replication

SVAPAR-154100

All

A node warmstart may occur to clear the condition when Fibre Channel adapter firmware has started processing a target I/O request, but has failed the request with status "Invalid Receive Exchange Address". (show details)

Symptom	Single Node Warmstart
Environment	Systems with Fibre Channel adapters
Trigger	None
Workaround	None

9.1.0.0

Fibre Channel

SVAPAR-154387

All

Running multiple supportupload commands in quick succession may cause an out of memory condition, which leads to a node warmstart. (show details)

Symptom	Single Node Warmstart
Environment	CLI
Trigger	Supportload command
Workaround	Do not run multiple supportupload commands in quick succession if they fail with: CMMVC8092E An error occurred in communicating with the remote server.

9.1.0.0

Command Line Interface

SVAPAR-154399

All

Policy-based high availability may be suspended and unable to restart after an upgrade to 8.7.2.x, due to a timing window. (show details)

Symptom	Loss of Redundancy
Environment	System using Policy-based high availability
Trigger	Upgrading to 8.7.2.x
Workaround	None

9.1.0.0

Policy-based High availability

SVAPAR-154963

All

On systems with 8.7.2 software, a single node assert may occur due to a race condition when deleting volumes, hosts or host mappings that are part of a policy-based high availability partition. (show details)

Symptom	Single Node Warmstart
Environment	8.7.2 systems using policy-based high availability
Trigger	Deleting volumes, hosts or host mappings that are part of a policy-based high availability partition.
Workaround	Avoid deleting volumes, hosts or host mappings that are part of a policy-based high availability partition until an upgrade to a version with the fix is done.

9.1.0.0

Policy-based High availability

SVAPAR-157561

All

Single node warmstart when collecting data from Ethernet SFPs times out. (show details)

Symptom	Single Node Warmstart
Environment	None
Trigger	None.
Workaround	None.

9.1.0.0

IP Replication, iSCSI

SVAPAR-158915

All

A single node warmstart may occur if a host issues more than 65535 write requests, to a single 128KB region of a policy-based replication or HA volume, within a short period of time. (show details)

Symptom	Single Node Warmstart
Environment	Systems using policy-based replication replication or HA with 8.7.1 or later software.
Trigger	More than 65535 write requests to a single 128KB region of a volume
Workaround	None

9.1.0.0

Policy-based High availability, Policy-based Replication

SVAPAR-159284

All

Multiple node asserts may occur on a system using IP Replication, if a low-probability timing window results in a node receiving an IP replication login from itself. (show details)

Symptom	Multiple Node Warmstarts
Environment	Systems using IP Replication.
Trigger	None
Workaround	None

9.1.0.0

IP Replication

SVAPAR-159430

All

Multiple node warmstarts may occur if a PBHA volume receives more than 100 persistent reserve registrations from hosts. (show details)

Symptom	Multiple Node Warmstarts
Environment	Policy Based High Availability with hosts using persistent reserve
Trigger	SCSI reserve used on a PBHA volume, where there are more than 100 paths between that volume and the host. For example, 16 hosts each with 2 ports, where each host port is visible to 4 storage ports, would result in 128 paths to a volume.
Workaround	Limit the number of hosts mapped to volume until the SCSI Persistent Reservation registrations count is below 100.

9.1.0.0

Policy-based High availability

SVAPAR-161263

All

Systems with NVMe hosts may experience multiple node warmstarts on 8.7.3.x software (show details)

Symptom	Multiple Node Warmstarts
Environment	Systems with NVMe hosts
Trigger	None
Workaround	None

9.1.0.0

Hosts

SVAPAR-164368

All

Recurring node warmstarts within an IO group after starting DRP recovery. (show details)

Symptom	Multiple Node Warmstarts
Environment	Data Reduction Pools
Trigger	repairpool -runrecovery
Workaround	None

9.1.0.0

Data Reduction Pools

SVAPAR-164839

All

A node containing iWARP adapters may fail to reboot. (show details)

Symptom	Loss of Redundancy
Environment	Systems with iWARP adapters.
Trigger	Rebooting a node canister.
Workaround	None

9.1.0.0

Reliability Availability Serviceability

SVAPAR-165194

All

A node warmstart may occur when a host issues a persistent reserve command to an HA volume, and another I/O is received at the exact time the persistent reserve command completes. (show details)

Symptom	Single Node Warmstart
Environment	Policy-based high availability with persistant reserves.
Trigger	None
Workaround	None

9.1.0.0

Policy-based High availability

SVAPAR-166971

All

Unable to change the replication mode of a volume group due to invalid internal state. (show details)

Symptom	Error in Error Log
Environment	Policy-based replication.
Trigger	Change the replication mode of a volume group to independent and then attempt to change it back to production.
Workaround	Work with IBM support and use manual commands to fix the invalid internal state.

9.1.0.0

Policy-based High availability, Policy-based Replication

SVAPAR-167040

All

Single node warmstart triggered by making the DR site into an independent copy whilst replication is still active. (show details)

Symptom	Single Node Warmstart
Environment	Systems running 8.7.1 or higher using policy-based replication
Trigger	Making the DR site independent before stopping replication. For example a DR testing procedure.
Workaround	Stop DR replication before making the DR site independent

9.1.0.0

Policy-based Replication

SVAPAR-168411

All

A single-node warmstart caused by the IO statistics processing exceeding a timeout (show details)

Symptom	Single Node Warmstart
Environment	None
Trigger	None
Workaround	None

9.1.0.0

Reliability Availability Serviceability

SVAPAR-169250

All

Adding a GKLM server at version 5.x may result in an error saying the key server is not supported. This is due to a change in the way that GKLM identifies itself when the storage system connects to it. (show details)

Symptom	Configuration
Environment	Systems using a GKLM server at version 5.x
Trigger	None
Workaround	None

9.1.0.0

Encryption

SVAPAR-170340

All

On systems using PBR/PBHA as well as FlashCopy, a node may warmstart due to a problem during background copy processing in the FlashCopy component. (show details)

Symptom	Multiple Node Warmstarts
Environment	System using PBR/PBHA and Flashcopy on pre-9.1.0.0 software
Trigger	None
Workaround	None

9.1.0.0

FlashCopy

SVAPAR-170368

All

FS50xx systems may incorrectly report failed batteries (node error 652) after a cold boot. (show details)

Symptom	Loss of Access to Data
Environment	None
Trigger	Cold boot (for example after a planned power down).
Workaround	Contact support to reset the failed battery marker.

9.1.0.0

Reliability Availability Serviceability

SVAPAR-170438

All

After a power outage, FCM drives may fail to come online when power is restored. (show details)

Symptom	Loss of Access to Data
Environment	System with FCM drives
Trigger	Power Outage
Workaround	Reseat the drives

9.1.0.0

Drives

SVAPAR-180551

All

Upgrade from 8.7.0 or 8.7.1, to 8.7.2 or 8.7.3, may cause a node warmstart if IPv6 addresses are in use. (show details)

Symptom	Single Node Warmstart
Environment	Systems with IPv6 addresses
Trigger	Software upgrade
Workaround	None

9.1.0.0

System Update

SVAPAR-92804

FS5000

SAS direct attach host path is not recovered after a node reboot causing a persistent loss of redundant paths. (show details)

Symptom	Loss of Redundancy
Environment	Mostly seen with ESXi hosts with Lenovo 430-8e SAS/SATA 12Gb HBA (LSI)
Trigger	Node reboot, warmstart.
Workaround	n/a

9.1.0.0

Hosts

SVAPAR-114758

All

Following a cluster recovery, the names of some back end storage controllers can be lost resulting in default names such as controller0. (show details)

Symptom	Configuration
Environment	Any with external storage controllers
Trigger	T2 cluster recovery
Workaround	None

9.1.0.0

Backend Storage

SVAPAR-130984

All

Configuring Policy-based replication in the GUI fails if the system authentication service type is unused. (show details)

Symptom	Configuration
Environment	Systems that previously upgraded from 8.3.0 or lower and used TIP (Tivoli Integrated Portal) authentication.
Trigger	Attempting to link pools or create a replication policy in the GUI
Workaround	Change authentication service type to LDAP using: 'svctask chauthservice -type ldap'

9.1.0.0

Policy-based Replication

SVAPAR-142190

All

The user role descriptions in the GUI are wrong for the CopyOperator. (show details)

Symptom	None
Environment	None
Trigger	None
Workaround	None

9.1.0.0

Graphical User Interface

SVAPAR-142939

FS5000

Upgrade to 8.7.1 on FS5045 with policy-based replication or high availability is not supported. (show details)

Symptom	Configuration
Environment	FS5045 with PBR or PBHA
Trigger	Attempted upgrade to 8.7.1
Workaround	None

9.1.0.0

Policy-based Replication

SVAPAR-144033

All

Spurious 1370 events against SAS drives which are not members of an array. (show details)

Symptom	Error in Error Log
Environment	Systems with SAS drives.
Trigger	None
Workaround	None

9.1.0.0

Reliability Availability Serviceability

SVAPAR-144062

All

A node may warmstart due to a problem with IO buffer management in the cache component. (show details)

Symptom	Single Node Warmstart
Environment	None
Trigger	None
Workaround	None

9.1.0.0

Cache

SVAPAR-144515

All

When trying to increase FlashCopy or volume mirroring bitmap memory, the GUI may incorrectly report that the new value exceeds combined memory limits. (show details)

Symptom	Configuration
Environment	8.7.0 or 8.7.1 systems using FlashCopy or volume mirroring
Trigger	Trying to increase bitmap space for FC / MR
Workaround	Use CLI to increase bitmap memory

9.1.0.0

FlashCopy, Volume Mirroring

SVAPAR-145892

All

An unfixed error might display an incorrect fixed timestamp (show details)

Symptom	Error in Error Log
Environment	Systems with an unfixed error in the eventlog
Trigger	A new unfixed error is logged and it re-uses an eventlog entry of an old fixed error
Workaround	Clear the error log

9.1.0.0

Reliability Availability Serviceability

SVAPAR-146640

All

When volume latency increases from below 1ms to above 1ms, the units in the GUI performance monitor will be incorrect. (show details)

Symptom	None
Environment	Systems running 8.7.x
Trigger	Volume latency increasing from below 1ms to above 1ms
Workaround	Refresh the GUI cache

9.1.0.0

Graphical User Interface

SVAPAR-148606

All

Storage Insights log collection may fail with the message "another wrapper is running:". Sometimes this prevents future log upload requests from starting. (show details)

Symptom	Configuration
Environment	Systems using Cloud Callhome
Trigger	Collecting a snap remotely via Cloud Callhome
Workaround	None

9.1.0.0

Call Home

SVAPAR-152472

FS5000

Volume group details view in the GUI might show a blank page for FlashSystem 5045 systems running 8.7.1 (show details)

Symptom	Configuration
Environment	FlashSystem 5045 using volume groups.
Trigger	None
Workaround	None

9.1.0.0

Graphical User Interface

SVAPAR-153310

All

Adding an HA policy to a partition may fail with a CMMVC1249E error. This will only happen if a DR partition in a 3-site configuration is deleted, a new partition is created with the same ID, and the user attempts to add an HA policy to that partition. (show details)

Symptom	Configuration
Environment	Systems using policy-based high availability with DR
Trigger	Attempt to create an HA partition after deletion of a DR partition.
Workaround	No Value

9.1.0.0

Policy-based High availability, Policy-based Replication

SVAPAR-156142

All

Persistent reservation requests for volumes configured with Policy-based High Availability might be rejected during a small timing window after a node comes online (show details)

Symptom	None
Environment	Systems with Policy-based High Availability and hosts using persistent reservations
Trigger	Hosts sending persistent reservation requests during a small timing window after a node comes online
Workaround	None

9.1.0.0

Policy-based High availability

SVAPAR-156146

All

The GUI's encryption panel displays "Encryption is not fully enabled" when encryption is enabled but the encryption recovery key has not been configured. (show details)

Symptom	Configuration
Environment	Systems running 8.6.2.0 or higher and using encryption.
Trigger	Enabling encryption and not configuring an encryption recovery key.
Workaround	None

9.1.0.0

Encryption, Graphical User Interface

SVAPAR-157164

All

Removing a volume group with a 3-site disaster recovery link may cause the volume group to have a state that prevents configuring it for 2-site asynchronous disaster recovery in the future (show details)

Symptom	Configuration
Environment	Systems using policy-based replication
Trigger	Removing a volume group that was configured for 3-site disaster recovery, then recreating the volume group and trying to configure 2-site disaster recovery
Workaround	None

9.1.0.0

Policy-based High availability, Policy-based Replication

SVAPAR-157700

All

Systems on 8.7.3 may be unable to establish a partnership for policy-based replication or high availability, with systems on lower code levels that have volume group snapshots. (show details)

Symptom	Configuration
Environment	One system running 8.7.3 and the partner system on a lower code level with volume group snapshots.
Trigger	Trying to create a partnership for policy-based replication or high availability.
Workaround	Upgrade all the systems to 8.7.3 or remove the volume group snapshots from the systems that are in the lower code level.

9.1.0.0

Policy-based High availability, Policy-based Replication

SVAPAR-159867

FS5000, FS7200, FS7300

A successful drive firmware update can report a 3090 event indicating that the update has failed. This is caused by some types of SAS drives taking longer to update. (show details)

Symptom	Error in Error Log
Environment	SAS drives
Trigger	Drive firmware update
Workaround	This is a cosmetic error, the upgrade does succeed when the event is reported.

9.1.0.0

Drives

SVAPAR-161517

All

Exported trust store file cannot be read (show details)

Symptom	Configuration
Environment	Systems with a trust store
Trigger	Exporting a trust store using the GUI or svctask chtruststore -export
Workaround	None

9.1.0.0

No Specific Feature

SVAPAR-161518

FS5000

Configuration backup and support data collection may create files with invalid JSON encoding (show details)

Symptom	None
Environment	Systems that do not support FlashSystem grid
Trigger	Collecting a configuration backup or support data collection (snap)
Workaround	None

9.1.0.0

Support Data Collection

SVAPAR-164062

All

lsvdisk does not accept the filter values 'is_safeguarded_snapshot' and 'safeguarded_snapshot_count'. (show details)

Symptom	Configuration
Environment	None
Trigger	None
Workaround	None

9.1.0.0

Command Line Interface

SVAPAR-164777

All

Failure to collect snaps using Storage Insights without a data collector from systems running 8.7.2 or higher (show details)

Symptom	Configuration
Environment	Systems using Storage Insights without a data collector
Trigger	Collecting a snap
Workaround	Creating and uploading a snap from the system management interface.

9.1.0.0

Reliability Availability Serviceability, Support Data Collection

SVAPAR-166429

All

After migration from remote copy to policy-based replication, volume groups may be unable to be set to "production" replication mode after they were made "independent". This is due to the migrated volumes having inconsistent configuration data. (show details)

Symptom	None
Environment	The system needs to have volumes that were migrated from remote copy to policy based replication.
Trigger	Change the replication mode to independent and then attempt to change it back to production.
Workaround	None.

9.1.0.0

Global Mirror, Policy-based Replication

SVAPAR-168102

All

Service GUI multi-factor authentication as superuser may not work, if the authentication provider is using PKCE (Proof Key for Code Exchange). (show details)

Symptom	Configuration
Environment	Systems using multi-factor authentication.
Trigger	None.
Workaround	None.

9.1.0.0

Graphical User Interface

SVAPAR-168639

All

The Licensed Functions view in the GUI may show incomplete information for restricted users. (show details)

Symptom	Configuration
Environment	None.
Trigger	None.
Workaround	None.

9.1.0.0

Graphical User Interface

SVAPAR-170309

All

The IP quorum application might not connect to a system if the request to discover node IP addresses fails (show details)

Symptom	Error in Error Log
Environment	Systems using Policy-based High Availability
Trigger	IP quorum fails to discover node IP addresses
Workaround	Re-deploy the IP quorum application

9.1.0.0

IP Quorum, Policy-based High availability

SVAPAR-170358

All

The system may experience unexpected 1585 DNS connection errors due to a DNS request timeout. (show details)

Symptom	Configuration
Environment	Systems with a DNS server configured.
Trigger	Slow Response time of DNS server causing a DNS request timeout.
Workaround	Check Response times for a DNS server which could lead to a timeout on DNS requests. 'traceroute' command from the cluster to the DNS server can help determine if there are routes that are slower than others.

9.1.0.0

Reliability Availability Serviceability

SVAPAR-170498

All

A timing window may cause a single-node warmstart, if a volume is deleted at the same time that volume compressibility is being measured. (show details)

Symptom	Single Node Warmstart
Environment	NA
Trigger	Volume deletion
Workaround	NA

9.1.0.0

Comprestimator

SVAPAR-178261

All

Incorrect snapshot information displayed under the snapshot properties of a volume in GUI. (show details)

Symptom	Configuration
Environment	Systems on 8.7.0 software or above that use volume group snapshots.
Trigger	None
Workaround	None

9.1.0.0

Snapshots

SVAPAR-93445

FS5100, FS5200, FS7200, FS7300, FS9100, FS9200, FS9500

A single node warmstart may occur due to a very low-probability timing window related to NVMe drive management. (show details)

Symptom	Single Node Warmstart
Environment	Systems with NVMe Drives
Trigger	None
Workaround	None

9.1.0.0

No Specific Feature

4. Useful Links

Description	Link
Product Documentation	SAN Volume Controller FlashSystem 9x00 FlashSystem 7x00 FlashSystem 5x00 FlashSystem C200
Concurrent Compatibility and Code Cross Reference	All Products
Support Information pages providing links to the following information: Interoperability information Product documentation Configuration Limits	SAN Volume Controller FlashSystem 9500 FlashSystem 9200 FlashSystem 7300 FlashSystem 7200 FlashSystem 5x00 FlashSystem C200
IBM Storage Virtualize Policy-based replication and High Availability Compatibility Cross Reference	All Products
Concurrent Compatibility and Code Cross Reference	All Products
Software Upgrade Test Utility	All Products
Software Upgrade Planning	All Products
IBM Storage Virtualize IP quorum application requirements	All Products