HP XP7 Storage - Manual (Page 4)

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 name CLPR number CLPR name CLPR number
CLPR16 16 CLPR0 0
CLPR17 17 CLPR1 1
CLPR18 18 CLPR2 2
CLPR19 19 CLPR3 3
CLPR20 20 CLPR4 4
CLPR21 21 CLPR5 5
CLPR22 22 CLPR6 6
CLPR23 23 CLPR7 7
CLPR24 24 CLPR8 8
CLPR25 25 CLPR9 9
CLPR26 26 CLPR10 10
CLPR27 27 CLPR11 11
CLPR28 28 CLPR12 12
CLPR29 29 CLPR13 13
CLPR30 30 CLPR14 14
CLPR31 31 CLPR15 15
4 Cache Partition operations