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SNMP Commands
Storage cluster nodes are controlled through the SNMP action commands. The following OIDs allow disabling nodes and volumes with nodes from a storage cluster:
castorShutdownAction. Disable nodes and volumes within nodes for servicing.
castorRetireAction. Disable nodes and volumes within nodes for retirement.
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To gracefully shut down a Swarm node, the string shutdown is written to the castorShutdownAction OID. Similarly, writing the string reboot to this OID causes a Swarm node to reboot.
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NoteWait at least 10 seconds in between each node reboot if rebooting more than one node at a time but not the whole cluster. This pause ensures verifies each node can communicate the rebooting state to the rest of the cluster, so other nodes do not initiate recovery for the rebooting node. |
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Each volume is given a unique name within the node – the device string from the vols line in the configuration file. To retire a volume, the name is written as a string to the castorRetireAction OID. The volume retirement process is initiated immediately upon receipt and the action cannot be aborted after it starts.
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To retire a node and all volumes, the all string is written to the castorRetireAction OID. The node retirement process is initiated immediately upon receipt and the action cannot be aborted after it starts.
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