IBM Storage Scale System 6000 Service Manual page 61

b. Display the state of the nodeclass associated with the IBM Storage Scale System 3500.
# mmgetstate -N <node class name>
c. If canister 2 (bottom) is currently designated as a quorum node, move the quorum to a different
node.
i) To determine which nodes are quorum nodes, issue the following command:
# mmlscluster
Example:
[root@ems9 ~]# mmlscluster
GPFS cluster information
========================
GPFS cluster name: shadow.test.net
GPFS cluster id: 1734066457280489467
GPFS UID domain: shadow.test.net
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 ess6000rw6a-hs.test.net 10.49.0.180 ess6000rw6a-hs.test.net quorum-manager-perfmon
2 ess6000rw6b-hs.test.net 10.49.0.181 ess6000rw6b-hs.test.net quorum-manager-perfmon
3 ems9-hs.test.net 10.49.0.40 ems9-hs.test.net quorum-perfmon
[root@ems9 ~]#
ii) To evaluate quorum status, issue the following command:
# mmgetstate -s
Example:
[root@ems9 ~]# mmgetstate -s
Node number Node name GPFS state
------------------------------------
3 ems9-hs active
Summary information
---------------------
Number of nodes defined in the cluster: 3
Number of local nodes active in the cluster: 3
Number of remote nodes joined in this cluster: 4
Number of quorum nodes defined in the cluster: 3
Number of quorum nodes active in the cluster: 3
Quorum = 2, Quorum achieved
[root@ems9 ~]#
iii) If necessary, to designate a different node to be a quorum node, issue the following command:
# mmchnode –quorum -N <node name>
Example:
[root@ems9 ~]# mmchnode --quorum -N ess6000rw6b-hs.test.net
Mon Sep 26 15:07:24 MST 2022: mmchnode: Processing node ess6000rw6b-hs.test.net
mmchnode: Propagating the cluster configuration data to all affected nodes.
[root@ems9 ~]#
iv) If necessary, to remove a quorum node from canister B/1, issue the following command:
# mmchnode –noquorum -N ess60005b
Example:
[root@ems9 ~]# mmchnode --noquorum -N ess6000rw6b-hs.test.net
Mon Sep 26 14:57:01 MST 2022: mmchnode: Processing node ess6000rw6b-hs.test.net
mmchnode: Propagating the cluster configuration data to all affected nodes.
mmchnode: Propagating the cluster configuration data to all
affected nodes. This is an asynchronous process.
[root@ems9 ~]#
11. Customer task: Unmount file systems that are mounted on canister 2 (bottom).
Unmount GPFS file systems from canister 2 (bottom):
# mmumount <file system name> -N <node name>
Chapter 1. Servicing (customer tasks) 49