Adding disks from a recovered site to the coordinator disk group
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Adding disks from a recovered site to the coordinator disk group

In a campus cluster environment, consider a case where the primary site goes down and the secondary site comes online with a limited set of disks. When the primary site restores, the primary site's disks are also available to act as coordinator disks. You can use the vxfenswap utility to add these disks to the coordinator disk group.

See About I/O fencing in campus clusters.

To add new disks from a recovered site to the coordinator disk group

  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 (sys1)
		1 (sys2)
RFSM State Information:
		node 0 in state 8 (running)
		node 1 in state 8 (running)
  3. Verify the name of the coordinator disk group.
    # cat /etc/vxfendg
vxfencoorddg
  4. Run the following command:
    # vxdisk -o alldgs list
    DEVICE				TYPE				DISK		GROUP				STATUS
rhdisk75				auto:cdsdisk				-		(vxfencoorddg)				online
rhdisk75				auto				-		-				offline
rhdisk75				auto				-		-				offline
  5. Verify the number of disks used in the coordinator disk group.
    # vxfenconfig -l
I/O Fencing Configuration Information:
======================================
Count                : 1
Disk List
Disk Name		 					Major		Minor		Serial Number					Policy
    /dev/vx/rdmp/rhdisk75							32		48		R450 00013154 0312					dmp
  6. When the primary site comes online, start the vxfenswap utility on any node in the cluster:
    # vxfenswap -g vxfencoorddg [-n]
  7. Verify the count of the coordinator disks.
    # vxfenconfig -l
I/O Fencing Configuration Information:
======================================
Single Disk Flag						: 0
Count                : 3
Disk List
Disk Name		 					Major		Minor		Serial Number					Policy
    /dev/vx/rdmp/rhdisk75							32		48		R450 00013154 0312					dmp
/dev/vx/rdmp/rhdisk76							32		32		R450 00013154 0313					dmp
/dev/vx/rdmp/rhdisk77							32		16		R450 00013154 0314					dmp
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Replacing the coordinator disk group in a cluster that is online Home Refreshing lost keys on coordinator disks