Using EMS HA Monitors

78 Chapter 6

Troubleshooting

Performance Considerations

Monitoring your system, although an important part of high-availability, consumes

system resources. You must carefully consider your performance needs against your

need to know as soon as possible when a failure threatens availability.

System Performance Issues

The primary performance impact will be related to the polling interval and the

number of resources being monitored. You need to balance your need to quickly

detect failures with your need for system performance and adjust the number of

resources you monitor and the polling intervals accordingly.

For example, pv_pvlink/status resource comprise the pv_summary resource. You

may only want to create one pv_summary monitoring request rather than monitoring

both pv_summary and pv_pvlink/status for all disks.

For polling intervals, you may want to set a short interval, 30 seconds, for resources

for require quick response after failure, and set a longer polling interval, 5 minutes

or more, for all other resources.

Network Performance Issues

Although monitoring is not likely to affect network performance, you may want to

make sure that only necessary messages are being sent. Make sure your monitor

requests are conﬁgured such that you are being notiﬁed only for things you really

need to know.