Linux server administration/sar/sar -d


 * To report disk (block devices) activity. See also.

sar -d 02:45:01 PM      DEV       tps     rkB/s     wkB/s   areq-sz    aqu-sz     await     svctm     %util 02:46:01 PM   dev7-0      0.00      0.00      0.00      0.00      0.00      0.00      0.00      0.00 02:46:01 PM   dev7-1      0.00      0.00      0.00      0.00      0.00      0.00      0.00      0.00 02:46:01 PM   dev7-2      0.00      0.00      0.00      0.00      0.00      0.00      0.00      0.00

column from  command also provide information about disk I/O requests. sar 01:12:01 PM    CPU     %user     %nice   %system   %iowait    %steal     %idle 01:13:01 PM    all      2.99      0.00      6.58      7.13      0.00     83.30 01:14:01 PM    all      5.39      0.00      2.30      6.70      0.00     85.61 01:15:01 PM    all      4.80      0.00      0.96      8.91      0.00     85.33 01:16:01 PM    all      4.65      0.00      0.64      6.19      0.00     88.52