HP XP Array Manager Software - Manual (Page 13)

rate calculated every minute (see Graph 2). If you select the Detail check box in the Performance
Management windows, the graph displays changes in the maximum, average, and minimum I/O
rates at 1–minute.
XP 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
Figure 2 on page 13 in which
the gathering interval is 1 minute, if you set an upper-limit of 150 IO/s for 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 IO/s. It is possible that the lines Max (1 min.) and Min (1 min.) in Graph 3 might exceed the
upper-limit.
Figure 2 Line graphs that indicate changes in port traffic
• Note on using XP Continuous Access Software: XP Performance Control monitors write I/O requests
issued from initiator ports of your storage system.
• Note on using the remote copy functions: When the remote copy functions (XP Continuous Access,
Hitachi TrueCopy for Mainframe, XP Continuous Access Journal Software, and Hitachi Universal
Replicator for Mainframe) are used in your environment, XP Performance Control monitors write
I/O requests issued from initiator ports of your storage system.
If you specify an RCU target port as a prioritized port, I/O requests from the initiator port will be
a target of threshold control.
If you specify an RCU target port as a non-prioritized port, I/O requests from the initiator port will
not be a target of upper-limit control.
XP24000/XP20000 Performance Control User's Guide 13