HP XP7 Cache Partition User Guide (H6F56-96002)

1 Cache Partition operations
This chapter describes and provides instructions for performing cache partitioning operations using
Cache Partition.
Overview of Cache Partition
The HP XP7 Storage system can connect to multiple hosts and can be shared by multiple users,
which can result in conflicts among users. For example, if a host issues many I/O requests or reads
or writes a large amount of data, the I/O performance of other hosts may be affected. Cache
Partition allows you to create multiple virtual cache memories called cache logical partitions, each
allocated to different hosts, to prevent contention for cache memory and improve I/O performance.
A cache logical partition (CLPR) is a pool of the cache and parity groups in the storage system.
Partitioning cache into one or more CLPRs allows storage administrators to dedicate individual
CLPRs to a different host, preventing I/O contention for cache memory. Partitioning cache dedicates
cache resources for exclusive use by specific applications to maintain priority and quality of service
for business-critical applications. Storage administrators can secure and/or restrict access to storage
resources to ensure confidentiality for specific applications. By dedicating resources to each partition
as needed, a high quality of service can be maintained for all users.
CLPR names
CLPR0 is the default CLPR in the storage system. If you have not yet created any cache logical
partitions, all cache belongs to CLPR0.
The following table lists the default CLPR names and associated CLPR numbers. CLPR names are
reserved, and you cannot change the CLPR numbers. For example, “CLPR2” cannot be changed
to CLPR number 1.
CLPR nameCLPR numberCLPR nameCLPR number
CLPR1616CLPR00
CLPR1717CLPR11
CLPR1818CLPR22
CLPR1919CLPR33
CLPR2020CLPR44
CLPR2121CLPR55
CLPR2222CLPR66
CLPR2323CLPR77
CLPR2424CLPR88
CLPR2525CLPR99
CLPR2626CLPR1010
CLPR2727CLPR1111
CLPR2828CLPR1212
CLPR2929CLPR1313
CLPR3030CLPR1414
CLPR3131CLPR1515
4 Cache Partition operations