Renaming a cluster pool or volume may show inconsistent behavior. If you are unable to list pools or volumes after renaming, open UMC from another window in incognito mode.
If the status of a healthy cluster is Down or Unknown, then increase the timeout value CLUSTER_LISTING_FAILURE_TIMEOUT = 2000 in the /opt/novell/umc/apps/umc-server/prod.env file. The default value is 2000 ms and due to network latency, it might not be able to retrieve the correct status of the cluster. Also, if this parameter is missing in the prod.env file, ensure to add it so cluster listing timeout occurs after the specified time.