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Decommissioning a Storage Container Manager

Storage Container Manager (SCM) decommissioning is the process in which you can gracefully remove one of the SCM from the SCM HA Ring.

To decommission an SCM and remove the node from the SCM HA ring, the following steps need to be executed.

ozone admin scm decommission [-hV] [--service-id=<scmServiceId>] -nodeid=<nodeId>

You can obtain the nodeId by executing this command, ozone admin scm roles

Leader SCM​

If you want to decommission the leader SCM, you must first transfer the leadership to a different SCM and then decommission the node.

To transfer the leader, we can execute below command,

ozone admin scm transfer [--service-id=<scmServiceId>] -n=<nodeId>

After successful leadership change you can proceed with decommissioning.

Primordial SCM​

If you want to decommission the primordial SCM, you have to change the ozone.scm.primordial.node.id property to point to a different SCM and then proceed with decommissioning.

Note​

During SCM decommissioning the private key of the decommissioned SCM should be manually deleted. The private keys can be found inside hdds.metadata.dir.

Manual deletion is needed until we have certificate revocation support (HDDS-8399)