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SNMP Commands
Storage cluster nodes are controlled through the SNMP action commands. The following OIDs enable you to disable 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.
When a node receives a shutdown or reboot action, it A node initiates a graceful stop by unmounting all of its volumes and removing itself from the cluster . For when it receives a shutdown , the or reboot action. The node is powered off if the hardware supports this action . For a reboot, the node will reboot to machinefor a shutdown. The node reboots, re-read reads the node or cluster configuration files, and startup starts up Swarm for a reboot.
A graceful shutdown is required to perform a quick reboot. Performing an ungraceful shutdown forces the node to perform consistency checks on all its volumes before it can rejoin rejoining the cluster.
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TipBefore shutting down or rebooting a node, check the node status page or the SNMP castorErrTable OID for critical error messages. Any logged critical messages will be are cleared upon reboot. |
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Note |
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Wait at least 10 seconds in between each node reboot if rebooting more than one node at a time but not the whole cluster |
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. This pause ensures |
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each node can communicate |
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the rebooting state to the rest of the cluster, so |
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other nodes do not initiate recovery for the rebooting node. |
Retire Action for Nodes and Volumes
The Retire action is used to permanently remove a node or a volume within a node from the cluster. This action is intended for retiring legacy hardware or pre-emptively preemptively pushing content away from a volume with a history of I/O errors. Retired volumes and nodes are visible in the Swarm Admin Console until the cluster is rebooted.
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NoteThe Retire action may take an extended amount of time to complete and requires at least three health processor cycles. |
Single volumes
When a volume is retired, all of its All stored objects are moved to other nodes in the storage cluster . After you initiate when a volume retirement, the is retired. The volume becomes a read-only volume and no additional objects can be stored on it . After all of the after initiating a volume retirement. The volume is idled with no further read/write requests after all objects are moved to other locations in the cluster, the volume is idled with no further read/write requests.
Each volume is given a unique name within its the node – the device string from the vols line in the configuration file. To retire a volume, its 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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Retiring a node means all volumes on the node are retired at the same time. After all volumes in the node are retired and the node data is copied elsewhere in the cluster, the node is permanently out of service and will does not respond to further requests.
To retire a node and all of its 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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WarningEnsure that Verify the cluster has enough free space and nodes to store the objects from the retiring volume. For subclusters, this applies to the subcluster where the retiring volume resides. If The retiring node cannot complete the retirement process until adding additional nodes if the number of nodes in the cluster or subcluster do not have enough space to store at least two replicas of all objects, the retiring node cannot complete the retirement process until you add additional nodes. The Retire action does not require that the configured default replicas ( |