Disk Analysis
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One of the most common causes of performance problems is an I/O bottleneck.  SarCheck identifies busy disks and slow disks. A variety of filtering and sorting options are available to help you manage very large systems with thousands of disk devices.

 

The device dad0 was busy an average of 1.7 percent of the time and had an average queue depth of 0.4 (when occupied). The average service time reported for this device and its accompanying disk subsystem was 13.7 milliseconds. This is relatively fast considering that queuing time is included in this statistic. Service time is the delay between the time a request was sent to a device and the time that the device signaled completion of the request.