Verifying that the nodes see the same disk


Verifying that the nodes see the same disk
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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/rhdisk75 path on node A and the /dev/rhdisk76 path on node B.

To verify that the nodes see the same disks

Verify the connection of the shared storage for data to two of the nodes on which you installed Cluster Server.
From node A, enter the following command:
```
# vxfenadm -i /dev/rhdisk75
```
```
Vendor id       : EMC     
Product id      : SYMMETRIX 
Revision        : 5567
Serial Number   : 42031000a
```
The same serial number information should appear when you enter the equivalent command on node B using the/dev/rhdisk76 path.

On a disk from another manufacturer, Hitachi Data Systems, the output is different and may resemble:
```
# vxfenadm -i /dev/rhdisk76
```
```
Vendor id       : HITACHI 
Product id      : OPEN-3 
Revision        : 0117
Serial Number   : 0401EB6F0002
```
Refer to the vxfenadm(1M) manual page for more information.

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