HP XP P9500 Storage - Manual (Page 7)

1 Performance improvement of storage system
Unless otherwise specified, the term P9000 in this guide refers to the following disk array:
•
P9500 Disk Array
The GUI illustrations in this guide were created using a Windows computer with the Internet Explorer
browser. Actual windows may differ depending on the operating system and browser used. GUI
contents also vary with licensed program products, storage system models, and firmware versions.
Performance Monitor
The Performance Monitor feature provides usage statistics about physical hard disk drives, volumes,
processors, or other resources in your storage system. Performance Monitor also provides statistics
about workloads on disk drives and traffic between hosts and the storage system. The Monitor
Performance window provides a line graph indicating changes in the usage rates, workloads, or
traffic. You can view information in the window and analyze trends in disk I/Os and detect peak
I/O time. If system performance is poor, you can use information in the window to detect bottlenecks
in the system. When using Performance Monitor, you must specify the volumes to be monitored in
(control units). Therefore, depending on your storage system configuration, the list may show
performance statistics for some volumes but not other volumes. This can occur if the range of used
CUs does not match the range of CUs monitored by Performance Monitor.
To use Performance Monitor, purchase the license key for the Performance Monitor product and
install the license key into the Remote Web Console computer. The Performance Monitor license
comes with array manager that is purchased for every array. For details about the license key and
installing program products, see HP P9000 Remote Web Console User Guide.
To correctly display performance statistics of a parity group and a LUSE volume, specify the
following:
•
All volumes belonging to the parity group as the monitoring targets.
•
All volumes making up the LUSE volume as the monitoring targets.
Cache Residency
The Cache Residency feature allows you to store frequently accessed data in the storage system's
cache memory. Cache Residency increases the data access speed for the cache-resident data by
enabling read and write I/Os to be performed at the higher front-end access speeds. Cache
Residency operations are performed using the licensed P9500 Remote Web Console software.
The Remote Web Console software communicates directly with the P9500 storage system via a
local-area network (LAN). The Remote Web Console software provides detailed Cache Residency
information and allows you to configure and perform Cache Residency operations for the data
stored on the P9500. For more information on using Remote Web Console, see the HP P9000
Remote Web Console User Guide.
To use Cache Residency, purchase the license key for Cache Residency or Cache Residency Z
program product and install the license key into the Remote Web Console computer. Cache
Residency is included with the array manager license. For details about the license key and installing
program products, see HP P9000 Remote Web Console User Guide.
Cache Residency supports prestaging of data. This option places specific data in the Cache
Residency cache before it is accessed by the host. When prestaging is selected, the host locates
the prestaged data in the Cache Residency cache from the first access, thus enhancing its access
performance.
Performance Monitor 7