1 cache partition operations, Overview of cache partition, Clpr names – HP XP7 Storage User Manual
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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
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Cache Partition operations