Multi-resource system monitoring tools such as vmstat provide the first indicators that a disk related bottleneck may exist. This section provides details on disk specific tools that are used to further investigate disk performance issues.
The goal of monitoring is to ensure that you, the system’s administrator, are warning of impending problems and slow-downs before your customers tell you about them.
Monitoring should be proactive and exception-based. When something is out of spec or out of norm, an alert should be sent. You should not rely only on reviews of logs or reports after the fact.
7.2.1. The iostat command
The iostat command is used for monitoring system input/output device load by observing the time the physical ...