Dell PS4000 Configuration Manual page 28

Sizing Replica Reserve and Delegated Space
The volume replication process in EqualLogic PS Series storage consumes extra storage space on both
the primary and secondary group partners. In addition to the space consumed by the volume itself,
each volume will require additional space in the primary group for Replication Reserve and Local
Reserve, plus delegated space for storing replica sets in the secondary group. This is illustrated in
Figure 8 below. A single delegated space on the secondary group must be used for all volumes
received from a specific primary group.
Delegated space for a replication partnership must be assigned to a pool (the ―Default‖ pool, by
default). Delegated space for different replication partnerships can be assigned to different pools on
the secondary group.
Figure 8 Replica Reserve, Local Reserve and Delegated Space
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