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In general, the cluster might look like this (

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Shared storage might be a SAN-attached device, Fibre channel attached device, or TCP/IP attached device. The device might be attached to all nodes simultaneously, or cluster resource manager can attach it to the active node only. The device might be in turn a resilient one, presenting the distributed file system with software or hardware replication between filesystem nodes. In the case of a geographically distributed cluster, the shared storage also can be distributed geographically in the same way as cluster nodes, and cluster resource manager can attach to the node the storage instance in the same geo location.