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

• “Viewing Dashboard” on page 105
• “Dashboard charts” on page 115
• “High watermark in dashboard charts” on page 116
Performance threshold metrics
The following table provides description of the Frontend, Cache, and Backend performance threshold
metric.
DescriptionScreen ele-
ments
Frontend
The IOPS threshold value indicates the average IO/s that you define an individual port to
manage over a specified duration. XP Performance Advisor uses this value to verify if the
average IO/s on each of the port is within or beyond the set threshold.
Even if one port exceeds the defined threshold, the icon is displayed.
IOPS
The MBPS threshold value indicates the average MB/s that you define an individual port
to manage over a specified duration. XP Performance Advisor uses this value to verify if
the average MB/s value on each of the port is within or beyond the set threshold.
Even if one port exceeds the defined threshold, the icon is displayed.
MBPS
The CHA util (%) threshold value indicates the average overall utilization of MPs on an
installed CHA. XP Performance Advisor uses this value to verify if the average overall
utilization of each CHA is within or beyond the set threshold.
The default threshold value is 70 %.
Even if one CHA exceeds the defined threshold, the icon is displayed.
CHA Util (%)
Cache
The Cache usage (%) threshold value indicates the total cache that should be utilized for
both the frontend and backend transactions over a specified duration. XP Performance
Advisor uses this value to verify if the total cache usage is within or beyond the set threshold.
Frontend transaction comprises of the data transfers between the cache and the frontend
ports. Backend transactions comprises of the data transfers between the cache and LDEVs
through the DKAs.
When Cache usage exceeds the defined threshold, the icon is displayed.
Cache Usage (%)
The Write pending (%) threshold value indicates the total number of write operations that
you define should be pending with the cache over a specified duration. XP Performance
Advisor uses this value to verify if the total write pending operations is within or beyond
the set threshold.
The Write pending metric comprises the number of writes that are pending to be written
from the cache to the LDEVs. The default threshold value is 28 %.
When Write pending exceeds the defined threshold, the icon is displayed.
Write Pending
(%)
Backend
Monitoring the XP array performance104