Checking Persistent Reserve

For Persistent Reserve to function properly, follow the courses of actios to determine the PR status.

About this task

For Persistent Reserve to function properly, you must have PR enabled on all of the disks that are PR-capable. To determine the PR status in the cluster:

Procedure

  1. Determine if PR is enabled on the cluster
    1. Issue mmlsconfig
    2. Check for usePersistentReserve=yes
  2. Determine if PR is enabled for all disks on all nodes
    1. Make sure that GPFS has been started and mounted on all of the nodes
    2. Enable PR by issuing mmchconfig
    3. Issue the command mmlsnsd -X and look for pr=yes on all the hdisk lines

What to do next

Notes:
  1. To view the keys that are currently registered on a disk, issue the following command from a node that has access to the disk:
    /usr/lpp/mmfs/bin/tsprreadkeys hdiskx
  2. To check the AIX® ODM status of a single disk on a node, issue the following command from a node that has access to the disk:
    lsattr -El hdiskx -a reserve_policy,PR_key_value