Storage Nodes

A storage node is described by its StorageNode resource, one per worker and NUMA socket slot, and operated through StorageNodeOps resources. Each StorageNodeOps names the target StorageNode, carries one action, and is driven to completion by the Simplyblock Operator. Two operations are raised by the operator itself: a HostMaintenance when the worker of a node is cordoned, and a Remove when a StorageNode that holds data is deleted.

A single device of a node is restarted with a StorageDeviceOps resource, as described in Storage Node Actions.

Topics

Topic	Purpose
Storage Node Actions	The StorageNodeOps kind: the target node, the actions, the locking, the tracking.
Shutting Down a Storage Node	Stopping one node while the rest of the cluster keeps serving I/O.
Restarting a Storage Node	Stopping and starting one node, optionally forced and reattaching its volumes.
Suspending a Storage Node	Stopping new volumes from being placed on a node that keeps running.
Resuming a Storage Node	Returning a suspended node to normal service.
Replacing a Storage Node	Choosing between a migration and a removal when hardware is replaced.
Migrating a Storage Node	Moving a storage node onto a different worker, keeping its identity and devices.
Removing a Storage Node	Draining the volumes off a storage node and taking it out of the cluster.
Coordinated Worker Node Drain	The HostMaintenance operation that protects storage while a worker is cordoned and drained.