HP XP7 PA Software User Guide

The following image shows the cache statistics for 10035, which belongs to the XP7 disk array.
HP XP7 Performance Advisor considers the following factors to arrive at the average usage data
for a component in the Frontend, Cache, Backend, and the MP Blade categories:
• Threshold limits set for metrics in the Frontend, Cache, Backend, or the MP Blade category
• Threshold duration (6 hours, 12 hours, or 24 hours)
After the threshold limits are defined for the categories and the corresponding metrics on the
Threshold Setting screen, HP XP7 Performance Advisor does the following for the XP/XP7 disk
arrays:
1. Monitors the usage of every component in the XP/XP7 disk array and retrieves the
appropriate values. It is based on the categories and the corresponding metrics for which the
threshold limits are defined:
• The average overall I/Os and MB/s on individual ports
• The average overall utilization of MPs that belong to a CHA
• The cache usage (%) and writes pending (%)
• The average sequential backend read tracks on individual RAID groups
• The average non-sequential backend read tracks (also known as random backend reads)
on individual RAID groups
• The average sequential backend write tracks on individual RAID groups
• The average utilization of a RAID group
108 Monitoring performance of XP and XP7 disk arrays