Storage Mirroring User Guide

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C !
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! Disaster Recovery for MSCS
Disaster Recovery for MSCS
A Microsoft cluster is a group of independent servers, called nodes, working together as a unit. Clients interact with a cluster
as though it is a single server. When a node in the cluster fails, Microsoft Cluster Server (MSCS) responds by moving the work
from the failed node to the other node in the cluster. Microsoft documents and recommends a standard cluster configuration
containing two machines sharing a SCSI disk. In this configuration, a single copy of the data resides on the SCSI disk and is
shared between the cluster nodes.
Storage Mirroring works in conjunction with MSCS to provide disaster recovery for an MSCS cluster. Storage Mirroring
continues to protect data when a source or target drive is moved from one node of a cluster to another either due to
administrator intervention or a node failure.
Data can be replicated in the following cluster configurations:
! A standalone source machine connected to a target cluster
! A source cluster connected to a standalone target machine
! A source cluster connected to a target cluster
Cluster Configurations
Storage Mirroring’s flexibility allows multiple configurations to be used with a cluster. Review the brief clustering overview on
the following page and then use the appropriate instructions based on your specific configuration.
! Cluster to Cluster Configuration on page C-3
! Cluster to Standalone Configuration on page C-11
! Standalone to Cluster Configuration on page C-19