- DWQT, VDWQT
- SPTH, DMTH, IWTH
- System hit ratio
- I/O rate/second
- Sort degradations
- VP Page-ins
- Unavailable Read/Write engines
There are many thresholds and exceptions that should be monitored and tracked on a regular basis, and some are more critical than others.
SPTH, DMTH, WITH, and EDMPool failures are critical and require immediate action – IWTH is not a problem unless you have hit SPTH and DMTH first.
Log Buffer unavailable and Unavailable Read/Write engines often points to poor dasd subsystem performance, and may have to be addressed from both sides to eliminate the problem.