Red Hat Summit26.4. Running inquorate clusters
If you take nodes out of a cluster for a long period of time and the loss of those nodes would cause quorum loss, you can change the value of the expected_votes parameter for the live cluster with the pcs quorum expected-votes command. This allows the cluster to continue operation when it does not have quorum.
Changing the expected votes in a live cluster should be done with extreme caution. If less than 50% of the cluster is running because you have manually changed the expected votes, then the other nodes in the cluster could be started separately and run cluster services, causing data corruption and other unexpected results. If you change this value, you should ensure that the wait_for_all parameter is enabled.
The following command sets the expected votes in the live cluster to the specified value. This affects the live cluster only and does not change the configuration file; the value of expected_votes is reset to the value in the configuration file in the event of a reload.
pcs quorum expected-votes votes
In a situation in which you know that the cluster is inquorate but you want the cluster to proceed with resource management, you can use the pcs quorum unblock command to prevent the cluster from waiting for all nodes when establishing quorum.
This command should be used with extreme caution. Before issuing this command, it is imperative that you ensure that nodes that are not currently in the cluster are switched off and have no access to shared resources.
# pcs quorum unblock
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