Testing the coordinator disk group using vxfentsthdw -c
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Testing the coordinator disk group using vxfentsthdw -c

Use the vxfentsthdw utility to verify disks are configured to support I/O fencing. In this procedure, the vxfentsthdw utility tests the three disks one disk at a time from each node.

• From the node galaxy, the disks are /dev/rhdisk75, /dev/rhdisk76, and /dev/rhdisk77.
• From the node nebula, the same disks are /dev/rhdisk80, /dev/rhdisk81, and
  /dev/rhdisk82.
• From the node galaxy, the disks are /dev/sdg, /dev/sdh, and /dev/sdi.
• From the node galaxy, the disks are /dev/sdx, /dev/sdy, and /dev/sdz.

  Note   To test the coordinator disk group using the vxfentsthdw utility, the utility requires that the coordinator disk group, vxfencoorddg, be accessible from two nodes.

To test the coordinator disk group using vxfentsthdw -c

1. Use the vxfentsthdw command with the -c option. For example:

   # vxfentsthdw -c vxfencoorddg

2. Enter the nodes you are using to test the coordinator disks:

   Enter the first node of the cluster:

   galaxy

   Enter the second node of the cluster:

   nebula

3. Review the output of the testing process for both nodes for all disks in the coordinator disk group. Each disk should display output that resembles:

   ALL tests on the disk /dev/rhdisk75 have PASSED.

   The disk is now ready to be configured for I/O Fencing on node galaxy as a COORDINATOR DISK.

   ALL tests on the disk /dev/rhdisk80 have PASSED.

   The disk is now ready to be configured for I/O Fencing on node nebula as a COORDINATOR DISK.

   ALL tests on the disk /dev/sdg have PASSED.

   The disk is now ready to be configured for I/O Fencing on node galaxy as a COORDINATOR DISK.

   ALL tests on the disk /dev/sdx have PASSED.

   The disk is now ready to be configured for I/O Fencing on node nebula as a COORDINATOR DISK.

4. After you test all disks in the disk group, the vxfencoorddg disk group is ready for use.

Removing and replacing a failed disk

If a disk in the coordinator disk group fails verification, remove the failed disk or LUN from the vxfencoorddg disk group, replace it with another, and retest the disk group.

To remove and replace a failed disk

1. Use the vxdiskadm utility to remove the failed disk from the disk group. Refer to the Veritas Volume Manager Administrator's Guide.
2. Add a new disk to the node, initialize it, and add it to the coordinator disk group.

   See Veritas Cluster Server Installation Guide for instructions to initialize disks for I/O fencing and to set up coordinator disk groups.

3. Retest the disk group.

   See Testing the coordinator disk group using vxfentsthdw -c