XP12000 (September 2005)

10 XP Disk/Cache Partition for the XP10000/XP12000

Virtual cache memory that the cache logical partition function partitions is referred to as CLPR.

Figure 1 Example of a CLPR

Figure 1 shows how a corporation’s cache memory is partitioned to three virtual cache memories.

Although the Branch A host is inputting and outputting a large amount of data, the Branch B and Branch C

hosts are unaffected because each branch is allocated 40 GB CLPR.

Storage management logical partitions (SLPRs)

A disk array can be shared with multiple organizations and multiple departments within an enterprise.

Therefore, multiple administrators might manage a single disk array. This creates the potential for an

administrator to destroy other organizations’ volumes, and it can complicate and increase the difficulty of

managing the disk array.

Use XP Disk/Cache Partition to allocate all of one disk array’s resources (all ports and CLPRs) to virtual

disk arrays called SLPRs. You can create up to 31 SLPRs in one disk array. Each virtual disk array can be

accessed only by its administrator. This approach eliminates the risk of an administrator destroying other

organizations’ volumes and of data leaks among organizations.

In a non-partitioned environment, a full array is considered one single partition SLPR0. After the disk array

is partitioned, SLPR0 becomes the unpartitioned portion of the disk array. Similarly, CLPR0 contains all