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Cache logical partitions (CLPRs)

When one disk array is shared with multiple hosts, and one host reads or writes a large amount of data,

the host’s read

and write data occupies a large area in the disk array’s cache memory. In this situation,

the I/O perform

ance of other hosts decreases because the hosts must wait to write to cache memory. To

prevent this situation, CLPR partitions the disk array’s cache memory. Partitioned cache m em ories are

used as virtual c ache memories, and each is allocated to each host. This approach minimizes the effects

of one adminis

trator’s operations on the volumes of other administrators.

Figure 56 Example of a CLPR

Example of a CLPR shows how a corporation’s cache memor y 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.

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Hp XP Performance Advisor Software Manuale Utente Pagina 130