HP StorageWorks XP External Storage user guide: HP XP12000 Disk Array, HP XP10000 Disk Array, HP 200 Storage Virtualization System (T1706-96017, June 2010)

• CLPR0: XP10000 for XP Business Copy P-VOL
• CLPR1: EVA3000 for XP Business Copy S-VOL (external LU cache is disabled)
In another example, Company B uses the following storage tiers:
• Tier 1 is an XP12000 (6 TB of internal space) for P-VOLs
• Tier 2 is an EVA (20 TB) for P-VOLs and XP Business Copy S-VOLs
• Tier 3 is two MSA 1500 (10 TB) for the XP Business Copy S-VOLs
Cache can be partitioned for Company B as follows:
• CLPR0: 12 GB for the internal XP12000 P-VOL
• CLPR1: 4 GB for the EVA S-VOL and P-VOL
• CLPR2: 4 GB for the MSA S-VOL
• All external LU cache is disabled
To partition cache for external storage:
1. Determine the number and size of the partitions you need (see Determining the number and size
of needed partitions).
2. Create the partitions (see Creating cache partitions).
Determining the number and size of needed partitions
The minimum cache partition (CLPR) size is 4 GB. Determine the size you need for each CLPR being
used for external storage based on the total capacity of the assigned external volumes. Table 5 shows
the recommended cache sizes for external storage CLPRs on open systems. Table 6 shows the same
information for HP storage virtualization systems.
Table 5 Recommended individual CLPR cache size for external storage on open systems
Recommended cache size for CLPRExternal storage volume capacity assigned to CLPR
4 GBLess than 128,000 GB
8 GB128,000 GB or more
Table 6 Recommended individual CLPR cache size for external storage on HP storage virtual systems
Additional CLPRsCLPR0External volume
capacity assigned
to CLPR
4 GB4 GBLess than 1 TB
4 GB8 GB
1 TB <= capacity <
16TB
4 GB12 GB
16 TB <= capacity <
20 TB
4 GB16 GB
20 TB <= capacity <
128 TB
8 GB24 GB128 TB or more
XP External Storage Software User Guide 61