Migrating data from Storwize family systems
You can use an iSCSI attachment to migrate data from a Storwize® family system to a Storwize V3700 system.
Before you begin
- Ensure that the Storwize V3700 system is running a level of software that can support iSCSI migration (minimum
version 7.7.0).Storwize V3700 supports iSCSI connections to migrate data from the following Storwize family systems:
- Storwize V3700
- Storwize V5000 and Storwize V5000 Gen2
- Storwize V7000, Storwize V7000 Gen2, and Storwize V7000 Gen2+
For more details about configuring iSCSI support for Storwize family systems, see Configuring IBM Storwize family storage systems.
- Verify that Ethernet ports are available and supported on each system.
- You can use any available Ethernet port to establish iSCSI connectivity between the Storwize V3700
system
and the backend storage controller. Note: If you are using onboard Ethernet ports to connect to a Storwize V5010 or Storwize V5020 iSCSI target system, ensure that onboard Ethernet port 2 on the system is not still configured to be used as the technician port.
- To avoid performance bottlenecks, the iSCSI initiator and target systems must use Ethernet ports at the same speed. Do not use a combination of Ethernet links that run at different speeds.
- You can use any available Ethernet port to establish iSCSI connectivity between the Storwize V3700
system
and the backend storage controller.
- Ensure that you have the appropriate number of Ethernet cables and switches to connect to the Ethernet ports on each system.
- Ensure that the Ethernet ports on each system are connected to the appropriate Ethernet
switches. For full redundancy and increased throughput, use two or more Ethernet switches.
Similarly-numbered Ethernet ports on each node of each system must be connected to the same switch.
They must also be configured on the same subnet or
VLAN.
For example, Figure 1 shows iSCSI connections between a Storwize V3700 system (iSCSI initiator) and a Storwize V3500 system (iSCSI target).
Each system consists of two nodes and a 4-port 10 Gbps Ethernet card is installed in each node. On each node, Ethernet port 1 on each card is connected to Switch 1. Ethernet port 2 on each node is connected to Switch 2.
Figure 1. Example of an iSCSI connection between two systems
Procedure
Configure the cabling and systems
- Connect the Ethernet cables from the ports on the Storwize V3700 iSCSI initiator system to the appropriate Ethernet switches. Use any available Ethernet port.
- Connect the Ethernet cables from the ports on the Storwize family iSCSI target system to the appropriate Ethernet switches. Use any available Ethernet port.
- Stop all host I/O operations.
- On the Storwize family system, unmap the logical drives that contain the data to be migrated to the Storwize V3700 system.
- Verify that the Storwize V3700 system is configured as a replication layer. To do so, enter the following
command.
svcinfo lssystem
- If the Storwize V3700 system is not
configured correctly, enter the following command.
svctask chsystem -layer replication
- If the Storwize V3700 system is not
configured correctly, enter the following command.
- Verify that the Storwize family system
is configured as a storage layer system. To do so, enter the following command.
svcinfo lssystem
- If the Storwize family system is not
configured correctly, enter the following command:
svctask chsystem -layer storage
- If the Storwize family system is not
configured correctly, enter the following command:
Establish the iSCSI connection
- On the Storwize V3700 system, enter
the following command to configure one or more ports that can be used for iSCSI attachment to a
backend storage system.
svctask cfgportip –node nodename -storage yes port_id
Note: If the ports are configured with IPv6 addresses, specify the -storage-6 parameter on the command. - On the Storwize family system, define
a new host by using the iSCSI information that was collected from the iSCSI initiator Storwize V3700 system.
svctask mkhost -iscsiname iscsi_name_list
- On the Storwize family system, map the
logical drives to the newly created host as a logical unit. You can use the management GUI to select and map several drives at one time. You can also
enter the following command to map each individual drive.
svctask mkvdiskhostmap -host hostname diskname
- hostname
- Name or ID of the host that you created in step 8.
- diskname
- Name or ID of the volume that you want to migrate to the Storwize V3700 system.
- On the Storwize V3700 system, enter
the following command to discover the available ports on the iSCSI target system. The
source_port_id is the Ethernet port on the Storwize V3700 iSCSI
initiator system through which the discovery is made. The ipv_addr is the IP
address of the port on the iSCSI target system.
svctask detectiscsistorageportcandidate –srcportid source_port_id -targetip ipv_addr
Notes:- If the ports on the iSCSI target system are configured with IPv6 addresses, specify the -targetip6 parameter.
- If the iSCSI target system requires authentication, specify the -username and -chapsecret parameters on the discovery request.
- Display information about the iSCSI ports that were discovered on the Storwize V3700 iSCSI
initiator system. This information includes the unique iSCSI qualified name (IQN) and Internet
Protocol (IP) combination.
svcinfo lsiscsistorageportcandidate
- Select one or more port candidates to configure. You can specify up to 64 candidate IDs, each
separated by a colon. The candidate_id is the value in the ID column of the
output displayed by the lsiscsistorageportcandidate command.
svctask addiscsistorageport candidate_id
Migrate the data
- On the Storwize V3700 system,
complete the following steps to manage the logical unit.
- To create one empty storage pool, enter the following command. The
extent_size is the size of the volume that you are migrating from the iSCSI
target system.
The logical unit that is mapped from the Storwize family system appears as an unmanaged-mode MDisk to the Storwize V3700 system.svctask mkmdiskgrp -ext extent_size
- To list the unmanaged-mode MDisks, enter the following command.
svcinfo lsmdisk
- If the new unmanaged-mode MDisk is not listed, perform a fabric-level discovery. Enter the
following to command to scan the network for the unmanaged-mode MDisks.
svctask detectmdisk
- To convert the unmanaged-mode MDisk to an image mode volume disk, enter the following
command.
svctask mkvdisk -vtype image -iogrp iogrp_name -mdiskgrp mdiskgrp_name -mdisk mdisk_name -mirrorwritepriority redundancy
- iogrp_name
- Name or ID of the I/O group.
- mdiskgrp_name
- Name or ID of the storage pool that you created in step 13.a.
- mdisk_name
- Name or ID of the unmanaged-mode MDisk.
- To list the hosts that were previously using the data that the MDisk now contains, enter the
following command.
svcinfo lssasportcandidate
- If the host does not exist on the Storwize V3700 system, you
can create a new iSCSI or Fibre Channel (or Fibre Channel over Ethernet) host.
- To create a new iSCSI host, enter the following
command.
svctask mkhost -iscsiname host_iqn
- To create a new FC or FCoE host, enter the following
command.
svctask mkhost -fcwwpn host_wwpn
- To create a new iSCSI host, enter the following
command.
- Enter the following command to map the new volume to the host. When the image mode volume is
mapped, it becomes accessible for I/O operations to the host.
svctask mkvdiskhostmap -host hostname diskname
- To create one empty storage pool, enter the following command. The
extent_size is the size of the volume that you are migrating from the iSCSI
target system.
- Enter the following command to display information about the storage pools that are visible to
the Storwize V3700 system.
svcinfo lsmdiskgrp
- If no storage pools are available on the Storwize V3700 system to
migrate the storage pool that you created in step 13.a, enter the following command to create a new storage
pool. The extent_size is the size of the volume that you are
migrating from the iSCSI target system.
svctask mkmdiskgrp -ext extent_size -name pool_name
- If no storage pools are available on the Storwize V3700 system to
migrate the storage pool that you created in step 13.a, enter the following command to create a new storage
pool. The extent_size is the size of the volume that you are
migrating from the iSCSI target system.
- Migrate the data from the Storwize family system to the storage pool on
Storwize V3700 system. For
more information about migrating data to volumes, see Managing volumes.
- To migrate data from the entire volume, enter the following
command.
svctask migratevdisk -mdiskgrp mdisk_group -vdisk vdisk_id
- To migrate data from selected extents, enter the following
command.
svctask migrateexts -source mdisk_name -exts num_extents -target new_mdisk -threads 4 -vdisk vdisk_id
- To migrate data from the entire volume, enter the following
command.
- To monitor the progress of the data migration, enter the following command.
svcinfo lsmigrate
Results
The data on the logical drives from the Storwize family system is migrated to the Storwize V3700 system. Host I/O operations are also switched to the Storwize V3700 system.
What to do next
- On the Storwize V3700 system, enter
the following command to display the configured ports on the iSCSI target
system.
svcinfo lsiscsistorageport
- Delete the configured iSCSI target ports. Specify the row number from the
lsiscsistorageport output to identify the sessions to delete.
svctask rmiscsistorageport lsiscsistorageport_row_id
- Disconnect the Ethernet cables that connect the Storwize V3700 system and the Storwize family system to the Ethernet switches.