Shared disks provide shared location for cluster-aware applications to save data. Shared disks allow cluster-aware applications, which might run on different nodes because of failover, to gain access to a logical volume in a consistent way, as if they are local at each of the nodes. Each virtual shared disk corresponds to a logical volume that is actually local at one of the nodes, which is called the server or primary node. Each node within the cluster must have access to a shared disk to operate within the cluster. The cluster system is configured so that only the active node can access the shared disk at any time.
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