General guidelines for using vxfentsthdw


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The utility requires two systems connected to the shared storage.
Caution The tests overwrite and destroy data on the disks, unless you use the -r option.
The two nodes must have ssh (default) or remsh communication. If you use remsh, launch the vxfentsthdw utility with the -n option.
After completing the testing process, remove permissions for communication and restore public network connections.

See Removing permissions for communication
To ensure both systems are connected to the same disk during the testing, you can use the vxfenadm -i diskpath command to verify a disk's serial number.
See Verifying the nodes see the same disk
For disk arrays with many disks, use the -m option to sample a few disks before creating a disk group and using the -g option to test them all.
When testing many disks with the -f or -g option, you can review results by redirecting the command output to a file.
The utility indicates a disk can be used for I/O fencing with a message resembling:
The disk /dev/rdsk/c4t8d0s2 is ready to be configured for I/O Fencing on node nebula

If the utility does not show a message stating a disk is ready, verification has failed.
If the disk you intend to test has existing SCSI-3 registration keys, the test issues a warning before proceeding.