Restrictions, Guidelines – HP XP P9500 Storage User Manual
Page 8
Restrictions
The following operations are not allowed when multiple CLPRs are involved:
•
Creating LUSE volumes across multiple CLPRs. If you forcibly perform this operation and create
a LUSE across multiple CLPRs, the LUSE volumes cannot be used for Continuous Access
Synchronous or Continuous Access Synchronous Z pair volumes.
•
Business Copy Quick Restore operations that affect multiple CLPRs.
•
Auto LUN manual migration operations that affect multiple CLPRs.
•
A parity group containing LDEVs assigned to Cache Residency cache extents (cache areas)
cannot be migrated to another CLPR. See the HP XP P9000 Performance for Open and
Mainframe Systems User Guide for more information about cache extents.
•
If you are using Continuous Access Journal, Continuous Access Journal data volumes and
journal volumes can belong to different CLPRs. All journal volumes in the same journal must
belong to the same CLPR. If not, an error occurs.
Guidelines
•
Install any needed additional cache memory before partitioning cache. It will be difficult to
add additional cache memory after partitioning cache into CLPRs.
•
If the cache capacity of defined CLPR is decreased by the Cache Residency cache area, cancel
Cache Residency bind mode setting, change the cache capacity of CLPR, and then set the
bind mode or priority mode again.
•
Best practice is to create cache logical partitions either during the initial installation and setup
or during a maintenance window, because cache logical partition operations can significantly
degrade host performance. If you must perform such operations on a production machine,
use Performance Monitor to verify that the write pending rate, including spikes, is well below
30%.
The table below shows CLPR names set by default to associated CLPR numbers. Because CLPR
names are reserved, they cannot be set to alternative CLPR numbers. For example, "CLPR2" cannot
be set to the 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
8
Creating virtual cache partitions