Which nodes in my cluster are quorum nodes?

Use the mmlscluster command to determine which nodes in your cluster are quorum nodes.

Output is similar to this:

GPFS cluster information
========================
GPFS cluster name: cluster2.kgn.ibm.com
GPFS cluster id: 13882489265947478002
GPFS UID domain: cluster2.kgn.ibm.com
Remote shell command: /usr/bin/ssh
Remote file copy command: /usr/bin/scp
Repository type: CCR

Node Daemon node name IP address Admin node name Designation
------------------------------------------------------------------------------
1 k164n04.kgn.ibm.com 198.117.68.68 k164n04.kgn.ibm.com quorum
2 k164n05.kgn.ibm.com 198.117.68.71 k164n05.kgn.ibm.com quorum
3 k164n06.kgn.ibm.com 198.117.68.70 k164n06.kgn.ibm.com

In this example, k164n04 and k164n05 are quorum nodes and k164n06 is a non-quorum node.

To change the quorum status of a node, use the mmchnode command. To change one quorum node to nonquorum, GPFS does not have to be stopped. If you are changing more than one node at the same time, GPFS needs to be down on all the affected nodes. GPFS does not have to be stopped when changing nonquorum nodes to quorum nodes, nor does it need to be stopped on nodes that are not affected.

For example, to make k164n05 a non-quorum node, and k164n06 a quorum node, issue these commands:

mmchnode --nonquorum -N k164n05
mmchnode --quorum -N k164n06

To set a node's quorum designation at the time that it is added to the cluster, see mmcrcluster command or mmaddnode command.