HP Storage Essentials SRM 6.0 User Guide for Enterprise Edition and Standard Edition SRM Software (July 2008)
Viewing Performance Data414
Sudden Dips Displayed in Certain Charts in Performance Manager
In Performance Manager and on the Monitoring tab, charts that display data gathered by certain
volume and drive counters display their charts with the results increasing to the maximum value and
then decreasing rapidly to a very low number that starts rising again.
The sudden dip in the charts occur because the counters holding the values displayed in the charts
can contain at most 2
31
(2147483648) integers. The counters revert back to zero after reaching
2
31
(2147483648) integers, and then they continue to go up again. The counters do not usually
display zero in a chart, because they are quickly gathering data again.
The following charts for individual drives are impacted: ReadIOs, WriteIOs, TotalIOs, Bytes
Transferred, Unrecovered Errors, Recovered Errors, Timeouts, Retried Requests.
The following charts for individual volumes are impacted: Bytes Read, Bytes Read Large, Bytes
Written, Bytes Written Large, ReadIOs Large, WriteIOs Large, ReadIOs, WriteIOs, TotalIOs, Bytes
Transferred, ReadHitIOs.
Values Continue to Increase in Charts for Aggregated Drives and
Aggregate Volumes
Values in charts for aggregate drives and aggregate volumes continue to rise smoothly in
Performance Manager and on the Monitoring tab. The only time the values in the charts come back
down to the values returned by the array is when the service for the management server restarts,
and then the charts display the values returned by the array. The values in the charts continue to rise
until the service for the management server is stopped.
The values in the charts continue to rise, because the values do not revert back to zero when an
individual drive or volume counter that makes up the aggregation contains 2
31
(2147483648)
integers. Instead, the values continue to rise smoothly.
Windows NT 4 N
Windows 2000 Y
Windows 2000 PowerPath N
Windows 2000 HDLM N
Windows 2000 RDAC N
Windows 2000 DAS N
Windows 2000 Volume Manager N
Windows 2000 Volume Manager and PowerPath N
Windows 2000 Volume Manager and HDLM N
Table 57 Host Monitoring Support (continued)
Host Configuration Monitoring Supported?