HP StorageWorks XP Remote Web Console Software - Manual (Page 13)

NOTE:
The PCR capacity (MB) described in the formula is the Partial Cache Residence capacity (MB). For
more information about standard cache capacity, see
Table 2 .
Table 2 Capacity for data in a hard disk drive associated with a CLPR and standard cache capacity
20.3TB or
more to 20.3TB to 14.4TB to 8.5TB to 2.6TB to 0.7TB Capacity
for data in
CLPR
24GB 20GB 16GB 12GB 8GB 4GB
Standard
cache
capacity
NOTE:
To calculate the capacity for data in a hard disk drive associated with a CLPR, add the following
formulas:
Number of parity groups: capacity of one disk x 3 x (3D+1P)
Number of parity groups: capacity of one disk x 6 x (6D+2P)
Number of parity groups: capacity of one disk x 7 x (7D+1P)
Number of parity groups: capacity of one disk x 2 x (2D+2D)
NOTE:
To add cache memories to the local array, install them with Standard Cache Access Model or
High Performance Cache Access Model mode. If the local array has additional printed circuit
boards (PCBs), you must use the High Performance Cache Access Model mode. For more
information about additional cache memories, contact your HP account support representative.
• Restriction on CLPR and CU group
You cannot allocate parity groups belonging to different CU groups to a CLPR other than CLPR0.
For more information about CU groups, see the HP StorageWorks XP Remote Web Console user
guide for XP12000/XP10000/SVS200.
Storage management logical partitions (SLPRs)
An array can be shared with multiple organizations, for example, enterprises and departments within
an enterprise. Therefore, multiple administrators who belong to different organizations might manage
one array. This creates the potential for an administrator who belongs in one organization to destroy
other organizations' volumes. Furthermore, it can complicate and increase the difficulty of managing
the array because of an incorrect operation by an administrator and its influence on other
organizations. The storage management logical partition function in XP Disk/Cache Partition allocates
all of an array's resources (that is, ports and CLPRs) to multiple virtual arrays. Each virtual array can
be accessed by only its administrator. Therefore, this prevents the risk that an administrator will destroy
another organization's volumes or leak another organization's data.
XP Disk/Cache Partition user guide 13