| Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 1 | What: /proc/diskstats |
| 2 | Date: February 2008 |
| 3 | Contact: Jerome Marchand <jmarchan@redhat.com> |
| 4 | Description: |
| 5 | The /proc/diskstats file displays the I/O statistics |
| 6 | of block devices. Each line contains the following 14 |
| 7 | fields: |
| 8 | |
| 9 | 1 - major number |
| 10 | 2 - minor mumber |
| 11 | 3 - device name |
| 12 | 4 - reads completed successfully |
| 13 | 5 - reads merged |
| 14 | 6 - sectors read |
| 15 | 7 - time spent reading (ms) |
| 16 | 8 - writes completed |
| 17 | 9 - writes merged |
| 18 | 10 - sectors written |
| 19 | 11 - time spent writing (ms) |
| 20 | 12 - I/Os currently in progress |
| 21 | 13 - time spent doing I/Os (ms) |
| 22 | 14 - weighted time spent doing I/Os (ms) |
| 23 | |
| 24 | Kernel 4.18+ appends four more fields for discard |
| 25 | tracking putting the total at 18: |
| 26 | |
| 27 | 15 - discards completed successfully |
| 28 | 16 - discards merged |
| 29 | 17 - sectors discarded |
| 30 | 18 - time spent discarding |
| 31 | |
| David Brazdil | 0f672f6 | 2019-12-10 10:32:29 +0000 | [diff] [blame] | 32 | For more details refer to Documentation/admin-guide/iostats.rst |