iostat (Disk Utilization Report)

iostat (Disk Utilization Report)

To display report for all the disks

$ iostat -d 10 10

To display for only a subset of disks

$ iostat -d hdisk0 hdisk1 hdisk2 10 10

Important column

• If %tm_act (% of the time the disk was active) is greater than 70, then indicates a IO bottleneck.
• kb_read indicates the amount of data read from the drive.
• kb_wrtn indicates the amount of data written to the drive.
• tps indicates the no. of transfers requested per second to the drive. A transfer is an IO request to that drive.

Thanks

iostat

The iostat tool is used to detect the IO bottleneck.

Syntax

$ iostat [options] [drives] [interval] [count]

where
options - d, s (d - disk utilization report, s - system throughput report)