HP StorageWorks XP Performance Advisor Software v4.6 User and Troubleshooting Guide (T1789-96094, June 2010)

Click the Usage, Writes pending, or Sidefile block to view a graphical representation of the Cache
performance for that particular CLPR. For more information on charts and using chart options, see
Plotting charts on page 213.
Advisory on CLPR utilization
XP Performance Advisor provides an advisory on the usage of individual CLPRs in an XP array. The
advisory is based on the data collected for the past one week. Following are the scenarios for which
an advisory is created:
If cache for a CLPR is less utilized, the advisory suggests that you consider re-allocating portion
of the cache memory to other CLPRs. This is in case the cache memory is not required for the current
CLPR.
If write pending data is more than the random read cache hits, the random read or write response
time may be high due to the writes pending with cache. The advisory suggests that you consider
increasing the cache size for the current CLPR or reassign some of the RAID groups associated
with the current CLPR.
If write pending data is more than the sequential read cache hits, the sequential pre-fetching of
data may not work. The advisory suggests that you consider increasing the cache size for the
current CLPR.
To view advisory for an individual CLPR:
1. Click the + sign for an XP array under Arrays in the left pane.
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