Dell PS4000 Configuration Manual page 25


All volumes that are part of a volume collection can only replicate with a single partner.

A volume can have up to a maximum of 512 replicas stored on a partner group.
For a PS4000 only group, you cannot exceed two replication partners and 32 volumes
o
configured for replication
Warning: Any type of application or operating system level process that causes block level
data changes will affect replication data size and time to complete. For example, file
system defragmentation of a large partition will significantly increase the amount of space
consumed in replica reserve, delegated space on the secondary group and time to complete
the next scheduled replication.
Example Replication Topologies
The following figures present various replication topologies or patterns that are possible to create
between EqualLogic PS Series storage arrays.

Figure 4 shows the basic replication paths, with one partner group hosting the primary copy of
the volume and a second partner group hosting the replica copy of the same volume. We also
show the reverse direction of the path for the Fast Failback replication feature, if it is enabled
for the replica set.

Figure 5 shows how a single group can support replication of multiple primary volumes to
different secondary replication partner groups.

Figure 6 shows how you can create bi-directional replication paths between partner groups.

Figure 7 shows a common scenario in which multiple primary groups replicate their volumes to
a single secondary group partner in a different location.
Figure 4 Basic Replication Partner Data Paths
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