| What: /proc/diskstats |
| Date: February 2008 |
| Contact: Jerome Marchand <jmarchan@redhat.com> |
| Description: |
| The /proc/diskstats file displays the I/O statistics |
| of block devices. Each line contains the following 14 |
| fields: |
| |
| 1 - major number |
| 2 - minor mumber |
| 3 - device name |
| 4 - reads completed successfully |
| 5 - reads merged |
| 6 - sectors read |
| 7 - time spent reading (ms) |
| 8 - writes completed |
| 9 - writes merged |
| 10 - sectors written |
| 11 - time spent writing (ms) |
| 12 - I/Os currently in progress |
| 13 - time spent doing I/Os (ms) |
| 14 - weighted time spent doing I/Os (ms) |
| |
| Kernel 4.18+ appends four more fields for discard |
| tracking putting the total at 18: |
| |
| 15 - discards completed successfully |
| 16 - discards merged |
| 17 - sectors discarded |
| 18 - time spent discarding |
| |
| Kernel 5.5+ appends two more fields for flush requests: |
| |
| 19 - flush requests completed successfully |
| 20 - time spent flushing |
| |
| For more details refer to Documentation/admin-guide/iostats.rst |
