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SCSI reservation agents manage LUN based locking using the SCSI3-PR (Persistent Reservation) protocols that shared storages support such as SAN.
This function can prevent data losses when no nodes in a cluster know the status of other nodes.
Shared disk DR
The disk shared between the two nodes of MCCS is copied to a remote server, so that data can be safely protected from disasters.
A remote server has no MCCS installed in it. Thus, you need to establish an additional service recovery plan.
VxVM disk group
It is used to manage a disk group of Veritas Windows Volume Manager.
The sub volumes of a disk group are not individually managed.
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