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Adding or removing coordinator disks

Use the following procedure to add disks to the coordinator disk group, or to remove disks from the coordinator disk group.

Note the following about the procedure:

  You must have an odd number (three minimum) of disks/LUNs in the coordinator disk group.

  The disk you add must support SCSI-3 persistent reservations; see Viewing guidelines for checking SCSI-3 support.

  You must reboot each system in the cluster before the changes made to the coordinator disk group take effect.

 To remove and replace a disk in the coordinator disk group

1. Log in as root user on one of the cluster systems.
2. Import the coordinator disk group. The file /etc/vxfendg includes the name of the disk group (typically, vxfencoorddg) that contains the coordinator disks, so use the command:

   # vxdg -tfC import 'cat /etc/vxfendg'

   where:

   -t specifies that the disk group is imported only until the system restarts.

   -f specifies that the import is to be done forcibly, which is necessary if one or more disks is not accessible.

   -C specifies that any import blocks are removed.

3. To add disks to the disk group, or to remove disks from the disk group, use the VxVM disk administrator utility, vxdiskadm.
4. After disks are added or removed, deport the disk group:

   # vxdg deport 'cat /etc/vxfendg'

5. Execute on all nodes in the cluster:

   # /etc/init.d/vxfen start