EMC CX700 Planning Manual page 72

Data Replication and Data Mobility Software
Reserved LUN Pool Setup Worksheet
SP
(A or B) Source LUN Size
a. This worksheet is also provided in the MirrorView/A and incremental SAN Copy sections.
b. EMC recommends 20% of the source LUN size.
4-10 EMC CLARiiON CX300, CX500, CX500i, and CX700 Storage Systems Configuration Planning Guide
Since snapshots use the reserved LUN pool, you need the following
information for system setup so you can bind LUNs for the reserved
LUN pool. The number of reserved LUNs should always be twice the
number of source LUNs. Note that MirrorView/A and incremental
SAN Copy also use the reserved LUN pool. One application can use a
reserved LUN as long as another application is not using it.
a
RAID Type for RAID Group ID of
Reserved LUN Pool Parent RAID Group
Reserved LUN ID
b
Reserved LUN Size (complete after
(Gbytes) binding)