HP StorageWorks XP Remote Web Console Software - Manual (Page 9)

XP Disk/Cache Partition user guide 9
1 XP Disk/Cache Partition for the XP10000/XP12000
The HP StorageWorks XP Disk/Cache Partition feature prevents performance degradation and data loss
that occur when connecting multiple hosts and sharing disk arrays among multiple departments and
multiple companies.
XP Disk/Cache Partition provides a mechanism to safeguard disk array configurations by isolating
operational areas. There is a possibility of changing or deleting a configuration created for a specific
customer by mistake. The configuration should be protected from unrelated tasks, such as a path through
which a host is connected and performing I/O, that could interrupt work in progress.
Use XP Disk/Cache Partition to partition a disk array into multiple virtual disk arrays. This helps protect
data because the virtual disk array’s administrator cannot access the other virtual disk arrays for which the
administrator is responsible.
XP Disk/Cache Partition features
XP Disk/Cache Partition has two components:
• ” Cache logical partitions (CLPRs) ” on page 9
• ” Storage management logical partitions (SLPRs) ” on page 10
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 other administrators’ volumes.