HP StorageWorks Storage Mirroring user's guide (T2558-96073, February 2008)

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10 X Protecting Data in a Cluster Environment
Protecting Data in a Cluster Environment
In a MSCS cluster configuration, a single copy of data resides on a SCSI disk that is shared between cluster nodes. Data is
available without users knowing which node owns a cluster resource. MSCS handles failover between nodes of the cluster. By
adding Storage Mirroring to a cluster environment, you can further protect your data by including it in a replication set and
then using a MSCS-capable resource to control transmission of the data to the target. If the cluster fails, the data you selected
will be available on the target.
Cluster configurations
Review the cluster configuration notes before establishing your connection.
 Configurations—Your configuration can be cluster-to-cluster, cluster-to-standalone, or standalone-to-cluster.
 Network—Each cluster's private network should be a unique subnet so that the Management Console will not attempt
to use an unreachable private network.
 Volumes—The source and target must have identical drive mappings.
Establishing the connection
1. If your source is a cluster, create a virtual server (including resources for an IP address, network name, and physical disk)
on the source cluster. With this configuration, users will access their data from the source cluster, regardless of which
node is currently in control. MSCS will handle failover between the nodes of the cluster. Storage Mirroring will handle
failover between the source cluster and the target (cluster or standalone). See your Microsoft documentation if you
need assistance creating a virtual server on the source cluster.
2. If your target is a cluster, create a virtual server (including resources for an IP address, network name, and physical disk)
on the target cluster. With this configuration, if there is a source failure, the data will be available for the users from the
target cluster, regardless of which node is currently in control. MSCS will handle failover between the nodes of the target
cluster. Storage Mirroring will handle failover between the source (cluster or standalone) and the target cluster. See your
Microsoft documentation if you need assistance creating a virtual server on the target cluster.