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 disk is accessible by the /dev/sdr path on node A and the /dev/sdt path on node B.
To verify that the nodes see the same disks
SCSI ID=>Host: 2 Channel: 0 Id: 0 Lun: E
The same serial number information should appear when you enter the equivalent command on node B using the /dev/sdt path.
On a disk from another manufacturer, Hitachi Data Systems, the output is different and may resemble: