Run the iostat -xtc command to display extended disk statistics.
$ iostat -xtc extended device statistics tty cpu device r/s w/s kr/s kw/s wait actv svc_t %w %b tin tout us sy wt id fd0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0 0 0 0 0 0 0 100 sd0 0.0 0.0 0.4 0.4 0.0 0.0 49.5 0 0 sd6 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0 0 nfs1 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0 0 nfs49 0.0 0.0 0.0 0.0 0.0 0.0 15.1 0 0 nfs53 0.0 0.0 0.4 0.0 0.0 0.0 24.5 0 0 nfs54 0.0 0.0 0.0 0.0 0.0 0.0 6.3 0 0 nfs55 0.0 0.0 0.0 0.0 0.0 0.0 4.9 0 0 |
The iostat -xtc command displays a line of output for each disk. The output fields are described in the following list.
Reads per second
Writes per second
Kbytes read per second
Kbytes written per second
Average number of transactions that are waiting for service (queue length)
Average number of transactions that are actively being serviced
Average service time, in milliseconds
Percentage of time that the queue is not empty
Percentage of time that the disk is busy