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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 north, the disks are /dev/rdsk/c1t1d0s2, /dev/rdsk/c2t1d0s2, and /dev/rdsk/c3t1d0s2.
• From the node south, the same disks are seen as /dev/rdsk/c4t1d0s2, /dev/rdsk/c5t1d0s2, and /dev/rdsk/c6t1d0s2.

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    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.

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 To test the coordinator disk group using vxfentsthdw -c

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

   # /opt/VRTSvcs/vxfen/bin/vxfentsthdw -c vxfencoorddg

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

   Enter the first node of the cluster:

   north

   Enter the second node of the cluster:

   south

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/rdsk/c1t1d0s2 have PASSED.

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

   ALL tests on the disk /dev/rdsk/c4t1d0s2 have PASSED.

   The disk is now ready to be configured for I/O Fencing on node south 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.

If you need to replace a disk in an active coordinator disk group, refer to the procedure in the troubleshooting chapter.

Adding or removing coordinator disks

 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.

   Initializing disks as VxVM disks

   Configuring coordinator disks

3. Retest the disk group.