HP Storage Mirroring Software - Manual (Page 27)

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In a GeoCluster configuration, data is stored on volumes local to each node and
replicated to each node in the cluster using Storage Mirroring Recover. Resources and
groups are handled in the same manner as a standard cluster. Instead of assigning one
group by SCSI drive, you assign one group per logical volume. If a server, disk, group, or
network interface should fail, MSCS relocates the failed group to another node, which
contains the replicated copy of the data, thus maintaining availability.