To confirm whether a disk (or LUN) supports SCSI-3 persistent reservations, two nodes must simultaneously have access to the same disks. Because a shared disk is likely to have a different name on each node, check the serial number to verify the identity of the disk. Use the vxfenadm
command with the -i
option to verify that the same serial number for the LUN is returned on all paths to the LUN.
For example, an EMC array is accessible by the /dev/vx/rdmp/c2t13d0 path on node A and by the /dev/vx/rdmp/c2t11d0 path on node B.
To verify that the nodes see the same disks
# /sbin/vxfenadm -i /dev/vx/rdmp/c2t13d0
The same serial number information should appear when you enter the equivalent command on node B using the /dev/vx/rdmp/c2t11d0 path.
On a disk from another manufacturer, Hitachi Data Systems, the output is different and may resemble: