This reports CPU and input/output statistics for devices. The iostat
command is used for monitoring system input/output device loading by observing the time the devices are active in relation to their average transfer rates. The first report generated by the iostat
command provides statistics concerning the time since the system was booted and hence is mostly useless. It is recommended to run it in a loop (using a parameter; for example, iostats –mx 6 9
). On multiprocessor systems, CPU statistics are calculated system-wide as averages, and are shown as follows:
The elements of the preceding command line are elaborated in the following table:
Column |
Description |
---|---|
|
Number of transfers (I/O requests) per second for the device. |
|
Blocks read per second. |
|
Blocks written per second. |
|
Total blocks read. |
|
Total blocks written. |
|
The number of read and write requests that were issued to the device per second. |
|
The... |