HP XP P9500 Storage - Manual (Page 12)

3 Interoperability of Performance Monitor and other products
This chapter describes the interoperability of Performance Monitor and other products.
Maintenance
If the storage system is undergoing following maintenance operations during monitoring, the
monitoring data might contain extremely large values.
•
Adding on, replacing, or removing cache memories.
•
Adding on, replacing, or removing disk drives.
•
Changing the system configuration.
•
Replacing the micro program.
Powering off the storage system
If the storage system is powered off during monitoring, monitoring stops while the storage system
is powered off. When the storage system is powered up again, monitoring continues. However,
Performance Monitor cannot display information about the period while the storage system is
powered off. Therefore, monitoring data immediately after powering on again might contain
extremely large values.
Viewing the Monitor Performance window
•
You will be able to view usage statistics that have been obtained for the last three months
(i.e., 93 days) in long range monitoring, and for the last 15 days in short range monitoring.
You will not be able to view usage statistics that expired after these storing periods because
such statistics are erased from the storage system. In short range, monitoring results are stored
for the last 8 hours to 15 days depending on the specified gathering interval. If the storing
period has passed before a monitoring result was obtained, the result is erased from the
storage system and you will not be able to view that monitoring result.
•
In long range, monitoring data is constantly collected. In short range, monitoring data is
collected only when the monitoring switch is set to ON. If the monitoring switch is set to
DISABLED, no long range or short range data is collected.
•
In short range, if I/O workloads between hosts and the storage system become heavy, the
storage system gives higher priority to I/O processing than monitoring processing, therefore,
a part of monitoring data might be missing. In case that monitoring data are missing frequently,
use the Edit Time Range dialog box to change the collection interval longer. For details, see
“Changing a display period ” (page 36) .
•
Short range monitoring data and long range monitoring data may have some margin of error.
•
If the SVP is overloaded, more time than the gathering interval allots might be required for
updating the display of monitoring data. In this case, some portion of monitoring data will
not be displayed in the window. For example, suppose that the gathering interval is 1 minute.
In this case, if the display in the Performance Management window is updated at 9:00 and
the next update occurs at 9:02, the window (including the graph) does not display the
monitoring result for the period of 9:00 to 9:01. This situation occurs when you use a Remote
Web Console computer, as well as when following maintenance operations are performed
for the storage system.
◦ Adding on, replacing, or removing cache memories.
◦ Adding on, replacing, or removing disk drives.
12 Interoperability of Performance Monitor and other products