Table of Disks

In many cases, disk data is most effectively viewed as a table. In this example, the disk statistics have been formatted into a table as well as text. Tables can be sorted by either percent busy or average service time, so that the most critical data is presented at the beginning of the table.

Note: 15 disks were present. By default, the presence of more than 12 disks causes SarCheck to only report on the busiest disks. This is meant to control the verbosity of this report. To see all disks included in the report, use the -d option.

The -dtoo switch has been used to format disk statistics into the following table.

Disk Device Statistics
Disk Device	Average Percent Busy	Peak Percent Busy	Queue Depth when occupied	Average Service Time
hdisk2	22.26	98.0	1.8	0.0
hdisk3	7.37	56.0	0.5	0.0
hdisk6	25.73	93.0	1.3	0.0
hdisk7	24.61	94.0	1.8	0.0
hdisk10	11.19	98.0	0.9	0.0

Please note that if RAID devices were present, %busy statistics reported for them are likely to be inaccurate and should be viewed skeptically. The presence of a RAID device is generally invisible to the operating system and therefore invisible to this program.

The disk device hdisk2 was busy an average of 22.26 percent of the time and had an average queue length of 1.8 (when occupied). This indicates that the device is not a performance bottleneck. During the peak interval the disk was 98.0 percent busy.

The disk device hdisk3 was busy an average of 7.37 percent of the time and had an average queue length of 0.5 (when occupied). This indicates that the device is not a performance bottleneck. During the peak interval from 14:15:00 to 14:20:00, the disk was 56.0 percent busy. Peak disk busy statistics can be used to help understand performance problems. If performance was worst when the disk was busiest, then a performance bottleneck may be that disk.

The disk device hdisk6 was busy an average of 25.73 percent of the time and had an average queue length of 1.3 (when occupied). This indicates that the device is not a performance bottleneck. During the peak interval from 11:20:00 to 11:25:00, the disk was 93.0 percent busy.

The disk device hdisk7 was busy an average of 24.61 percent of the time and had an average queue length of 1.8 (when occupied). This indicates that the device is not a performance bottleneck. During the peak interval from 14:50:00 to 14:55:00, the disk was 94.0 percent busy.

The disk device hdisk10 was busy an average of 11.19 percent of the time and had an average queue length of 0.9 (when occupied). This indicates that the device is not a performance bottleneck. During the peak interval from 14:45:00 to 14:50:00, the disk was 98.0 percent busy.