Hp XP P9000 Performance Advisor Software Manual de usuario descargar pdf (Pagina 400)

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enterprise B's disk array administrator can manage enterprise B's virtual disk array, but cannot manage

enterprise A's disk array.

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 performance 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

memories are used as virtual cache memories, and each is allocated to each host. This approach

minimizes the effects of one administrator's operations on the volumes of other administrators.

Figure 37 Example of a CLPR

“Example of a CLPR” on page 400 displays 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.

Appendix A400

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