HP XP P9000 for Compatible High Perf FICON Connectivity Software - Manual (Page 21)

Changing the time setting of SVP
If the monitoring switch function is performed, do not change the time setting of SVP. If the time
setting is changed, the following problems can happen:
•
Invalid monitoring data appears.
•
No monitoring data is collected.
If the time setting of SVP is changed, turn off the monitoring switch, and then turn on the switch.
After that, obtain the monitoring data. For details about the monitoring switch, see
“Starting
monitoring” (page 28) .
Using Performance Control
•
Starting Performance Control. Ensure that the Time Range in the Monitor Performance window
is not set to Use Real Time. You cannot start Performance Control in real-time mode.
•
I/O rates and transfer rates. Performance Control runs based on I/O rates and transfer rates
measured by Performance Monitor. Performance Monitor measures I/O rates and transfer
rates every second, and calculates the average I/O rate and the average transfer rate for
every gathering interval (specified between 1 and 15 minutes) regularly.
Suppose that 1 minute is specified as the gathering interval and the I/O rate at the port 1-A
changes as illustrated in Graph 1. When you use Performance Monitor to display the I/O
rate graph for 1A, the line in the graph indicates changes in the average I/O rate calculated
every minute (refer to Graph 2). If you select the Detail check box in the Performance Monitor
windows, the graph displays changes in the maximum, average, and minimum I/O rates in
one minute.
Performance Control applies upper limits and thresholds to the average I/O rate or the average
transfer rate calculated every gathering interval. For example, in the following figures in which
the gathering interval is 1 minute, if you set an upper limit of 150 I/Os to the port 1A, the
highest data point in the line CL1-A in Graph 2 and the line Ave.(1 min) in Graph 3 is
somewhere around 150 I/Os. It is possible that the lines Max (1 min.) and Min (1 min.) in
Graph 3 might exceed the upper limit.
Figure 6 Graph 1: actual I/O rate (measured every second)
Figure 7 Graph 2: I/O rate displayed in Performance Monitor (the Detail check box is not
selected)
Changing the time setting of SVP 21