Hitachi HF-W2000 58 Instruction Manual page 240

NOTE
You might not be able to start collecting performance counter data when the system load is high. After you start
collecting performance counter data, confirm that the status of the data collector set you are using is Running.
Confirm that the Performance Counter data collection has started properly.
In addition, if the system load is high or if you repeatedly start and stop collecting performance counter data,
sometimes you cannot start or stop collecting performance counter data.
If this situation happens, terminate Performance Monitor, wait for a while, restart Performance Monitor, and then
start collecting data again.
If you cannot start collecting performance counter data even after you have restarted Performance Monitor, restart
the system.
Performance Counter data cannot be collected.
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Confirm that the status of the
data collector set you are using
is Running.
The start and stop buttons are
disabled and you cannot use
them.
9. TROUBLESHOOTING