To replace the coordinator diskgroup

1. Make sure system-to-system communication is functioning properly.
2. Make sure that the cluster is online.

   # vxfenadm -d

   I/O Fencing Cluster Information:
   ================================
   Fencing Protocol Version: 201
   Fencing Mode: SCSI3
   Fencing SCSI3 Disk Policy: dmp
   Cluster Members:
   		* 0 (galaxy)
   		1 (nebula)
   RFSM State Information:
   		node 0 in state 8 (running)
   		node 1 in state 8 (running)

3. Find the name of the current coordinator diskgroup (typically vxfencoorddg) that is in the /etc/vxfendg file.

   # cat /etc/vxfendg
   vxfencoorddg

4. Find the alternative disk groups available to replace the current coordinator diskgroup.

   # vxdisk -o alldgs list

   DEVICE				TYPE				DISK		GROUP				 STATUS
   rhdisk64				auto:cdsdisk				-		(vxfendg)				  online
   rhdisk65				auto:cdsdisk				-		(vxfendg)				  online
   rhdisk66				auto:cdsdisk				-		(vxfendg)				  online
   rhdisk75				auto:cdsdisk				-		(vxfencoorddg)	online
   rhdisk76				auto:cdsdisk				-		(vxfencoorddg)	online
   rhdisk77				auto:cdsdisk				-		(vxfencoorddg)	online

5. Validate the new disk group for I/O fencing compliance. Run the following command:

   # vxfentsthdw -c vxfendg

   See Testing the coordinator disk group using vxfentsthdw -c option.

6. If the new disk group is not already deported, run the following command to deport the disk group:

   # vxdg deport vxfendg

7. Make sure that the /etc/vxfenmode file is updated to specify the correct disk policy.

   See the Veritas Cluster Server Installation Guide for more information.

8. From any node, start the vxfenswap utility. For example, if vxfendg is the new diskgroup that you want to use as the coordinator diskgroup:

   # vxfenswap -g vxfendg [-n]

   The utility performs the following tasks:

   • Backs up the existing /etc/vxfentab file.

   • Creates a test file /etc/vxfentab.test for the diskgroup that is modified on each node.

   • Reads the diskgroup you specified in the vxfenswap command and adds the diskgroup to the /etc/vxfentab.test file on each node.

   • Verifies that the serial number of the new disks are identical on all the nodes. The script terminates if the check fails.

   • Verifies that the new disk group can support I/O fencing on each node.

9. If the disk verification passes, the utility reports success and asks if you want to replace the coordinator disk group.

10. Confirm whether you want to clear the keys on the coordination points and proceed with the vxfenswap operation.

    Do you want to clear the keys on the coordination points 
    and proceed with the vxfenswap operation? [y/n] (default: n) y

11. Review the message that the utility displays and confirm that you want to replace the coordinator disk group. Else skip to step 14.

    Do you wish to commit this change? [y/n] (default: n) y

    If the utility successfully commits, the utility moves the /etc/vxfentab.test file to the /etc/vxfentab file.

    The utility also updates the /etc/vxfendg file with this new diskgroup.

12. Set the coordinator attribute value as "on" for the new coordinator disk group.

    # vxdg -g vxfendg set coordinator=on

    Set the coordinator attribute value as "off" for the old disk group.

    # vxdg -g vxfencoorddg set coordinator=off

13. Verify that the coordinator disk group has changed.

    # cat /etc/vxfendg
    vxfendg

    The swap operation for the coordinator disk group is complete now.

14. If you do not want to replace the coordinator disk group, answer n at the prompt.

    The vxfenswap utility rolls back any changes to the coordinator diskgroup.