HP StorageWorks P9000 Performance Advisor Software v5.3 User and Troubleshooting Guide (T1789-96322, August 2011)

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 34 Example of a CLPR
.
“Example of a CLPR” on page 410 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 A410