Veritas Storage Foundation 5.1 SP1 Cluster File System Installation Guide (5900-1510, April 2011)

Checking shared disks for I/O fencing
Make sure that the shared storage you set up while preparing to configure SFCFS
meets the I/O fencing requirements. You can test the shared disks using the
vxfentsthdw utility. The two nodes must have ssh (default) or remsh
communication. 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. This command option verifies that the same serial number for the
LUN is returned on all paths to the LUN.
Make sure to test the disks that serve as coordinator disks.
The vxfentsthdw utility has additional options suitable for testing many disks.
Review the options for testing the disk groups (-g) and the disks that are listed
in a file (-f). You can also test disks without destroying data using the -r option.
See the Veritas Storage Foundation Cluster File System Administrator's Guide.
Checking that disks support SCSI-3 involves the following tasks:
■ Verifying the Array Support Library (ASL)
See “Verifying Array Support Library (ASL)” on page 151.
■ Verifying that nodes have access to the same disk
See “Verifying that the nodes have access to the same disk” on page 152.
■ Testing the shared disks for SCSI-3
See “Testing the disks using vxfentsthdw utility” on page 153.
Verifying Array Support Library (ASL)
Make sure that the Array Support Library (ASL) for the array that you add is
installed.
151Configuring SFCFS for data integrity
Setting up disk-based I/O fencing using installsfcfs