3.1.1.1.1.2 Maintenance Mode
A storage class resource supports a mode of operation where the storage device is part of the cluster configuration and in the online state but allows for maintenance activity to take place that will not affect the health of the resource from the cluster's perspective.
There are two types of maintenance modes for storage class resources: simple and extended. In simple mode, the server suppresses negative health indications for the resource and continues to advertise that the resource is in the online state.
Extended mode is further subdivided by three types: disable health check, offline disk, and remove from cluster control.The "disable health check" extended mode type is equivalent to placing the resource in maintenance mode via simple mode. The "offline disk" type instructs the resource to internally perform the operations of placing the disk in the offline state while the state of the resource remains online. The "remove from cluster control" type instructs the resource to internally take the disk offline and unmount it from the system, thereby facilitating operations such as hot swapping.