Planning For System Performance - HP StorageWorks P9000 User Manual

serial number. It is possible that a serial number overlap could occur. If you have two systems
with the same serial number, contact HP Technical Support for assistance.
When you connect the storage systems with the following combinations, the range you can
specify for each model is restricted.
◦ P9500 Disk Array and XP12000 Disk Array
When you connect P9500 Disk Array and XP12000 Disk Array, you may specify the range
as shown in the following table.
Table 3 Range you can specify when you connect P9500 Disk Array and XP12000 Disk
Array/XP10000 Disk Array
Restriction item
Port number
LUN
2
LDKC :CU:LDEV
1
It does not affect to the value whether the model connects as MCU or RCU.
2
LDKC number is applied only for P9500 Disk Array.
3
If you connect P9500 with XP12000 Disk Array/XP10000 Disk Array, or P9500 with XP24000/XP20000
Disk Array, contact your HP representative for further information on XP12000 Disk Array/XP10000 Disk Array
and XP24000/XP20000 Disk Array DKCMAIN program version.

Planning for system performance

Remote copy operations can affect I/O performance on the host and primary and secondary
systems. Continuous Access Synchronous provides several options for minimizing the impact of
synchronous operations on performance, or maximize the effectiveness of copy operations to
ensure the best level of backup data integrity. The following options address I/O and performance:
RCU options (see
System- and CU-wide options regarding initial copy (see
concurrently, path watch time" (page
Pair options (see field descriptions in
Your HP service provider can also help you optimize copy operations and performance as follows:
Analyze write-workload. The workload data you collect (MB/s and IOPS) helps determine the
following key elements. When sized properly, they form a data path that operates free of
data bottlenecks under all workload levels (bottlenecks severely impact performance).
Amount of bandwidth
◦
◦ Number of data paths
◦ Number of host-interface paths
◦ Number of ports dedicated for Continuous Access Synchronous on the primary and
secondary systems
If you are setting up Continuous Access Synchronous for disaster recovery, make sure that
secondary systems are attached to a host server. This enables both the reporting of sense
information and the transfer of host failover information. If the remote site is unattended by a
host, you should attach the systems to a host server at the main site so that the system
administrator can monitor conditions.
16 Planning for Continuous Access Synchronous
1
P9500 Disk Array
From 1A to GR
From 0000 to 03FF
From 00:00:00 to 00:3F:FF
"RCU maintenance" (page 60)
44))
"Create pairs" (page
XP12000 Disk Array/XP10000 Disk
1 3
Array
From 1A to GR
From 0000 to 03FF
From 00:00 to 3F:FF
and accompanying information)
"Set number of volumes to be copied
46))