Veritas Storage Foundation 5.1 SP1 for Oracle RAC Administrator"s Guide (5900-1512, April 2011)

Refer also to the vxfentsthdw(1M) manual page.
About general guidelines for using vxfentsthdw utility
Review the following guidelines to use the vxfentsthdw utility:
■ 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 rsh communication. If you use rsh,
launch the vxfentsthdw utility with the -n option.
After completing the testing process, you can remove permissions for
communication and restore public network connections.
■ 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 that the nodes see the same disk” on page 118.
■ 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.
■ The utility indicates a disk can be used for I/O fencing with a message
resembling:
The disk /dev/vx/rdmp/c1t1d0 is ready to be configured for
I/O Fencing on node galaxy
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.
About the vxfentsthdw command options
Table 2-4 describes the methods that the utility provides to test storage devices.
Table 2-4
vxfentsthdw options
When to useDescriptionvxfentsthdw option
Use when rsh is used for
communication.
Utility uses rsh for
communication.
-n
107Administering SF Oracle RAC and its components
Administering I/O fencing