Quorum disks on HDS USP and NSC
To host quorum disks on HDS USP and NSC storage systems, you must be aware of the system requirements for establishing quorum disk for these storage systems.
The Storwize V3700 clustered system uses a quorum disk to store important system configuration data and to break a tie in the event of a SAN failure. The system automatically chooses three managed disks (MDisks) as quorum disk candidates. Each disk is assigned an index number: either 0, 1, or 2. Although a system can be configured to use up to three quorum disks, only one quorum disk is elected to resolve a tie-break situation. The purpose of the other quorum disks is to provide redundancy if a quorum disk fails before the system is partitioned.
Requirements for HDS TagmaStore USP, HP XP10000/12000, and NSC55:
- Firmware version Main 50-09-72 00/00 or later is running. Contact HDS or HP support for details on installing and configuring the correct firmware version.
- System Option 562 is enabled. Contact HDS or HP support for details on System Option 562.
- All Storwize V3700 ports are configured in a single HDS or HP host group.
Requirements for HDS TagmaStore USPv, USP-VM, and HP XP20000/24000:
- Firmware version Main 60-04-01-00/02 or later is running. Contact HDS or HP support for details on installing and configuring the correct firmware version.
- Host Option 39 is enabled. Contact HDS or HP support for details on Host
Option 39. Note: This option must be applied to the HDS or HP host group that is used for the Storwize V3700 system.
- All Storwize V3700 ports are configured in a single HDS or HP host group.
- Issue
the chcontroller command:
where controller_id or controller_name is the controller that corresponds to the relevant HDS or HP storage system.chcontroller -allowquorum yes controller_id or controller_name
- Repeat step 1 for each controller that is part of the relevant HDS or HP storage system.
- Issue the setquroum command:
where mdisk_id or mdisk_name is the relevant MDisk on the HDS or HP system.setquroum -quorum [0|1|2] mdisk_id or mdisk_name
The support website provides current information about quorum support: