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The shared disk DR resource replicate a shared disk in a cluster to an off-site DR node for disaster recovery purpose.
The shared disk DR resource is composed of three nodes that manage the shared disk. The off-site DR node is target replica, but not the member of cluster.
In other words, MCCS is not involved with automatic operation like failover, online and offline of the off-site node, so human intervention is needed to recover from a disaster at the node. Data is replicated from the source-primary node to the off-site DR node and the source-secondary node that cannot access the shared disk recognizes the shared disk as the one having the "NONE" role.
Thus, the off-site DR node and the "NONE" node are locked and these cannot write or read the data to prevent data corruption.
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[Figure] Mirroring Configuration
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