| 1 | What: /proc/diskstats |
| 2 | Date: February 2008 |
| 3 | Contact: Jerome Marchand <[email protected]> |
| 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 | == =================================== |
| 10 | 1 major number |
| 11 | 2 minor number |
| 12 | 3 device name |
| 13 | 4 reads completed successfully |
| 14 | 5 reads merged |
| 15 | 6 sectors read |
| 16 | 7 time spent reading (ms) |
| 17 | 8 writes completed |
| 18 | 9 writes merged |
| 19 | 10 sectors written |
| 20 | 11 time spent writing (ms) |
| 21 | 12 I/Os currently in progress |
| 22 | 13 time spent doing I/Os (ms) |
| 23 | 14 weighted time spent doing I/Os (ms) |
| 24 | == =================================== |
| 25 | |
| 26 | Kernel 4.18+ appends four more fields for discard |
| 27 | tracking putting the total at 18: |
| 28 | |
| 29 | == =================================== |
| 30 | 15 discards completed successfully |
| 31 | 16 discards merged |
| 32 | 17 sectors discarded |
| 33 | 18 time spent discarding |
| 34 | == =================================== |
| 35 | |
| 36 | Kernel 5.5+ appends two more fields for flush requests: |
| 37 | |
| 38 | == ===================================== |
| 39 | 19 flush requests completed successfully |
| 40 | 20 time spent flushing |
| 41 | == ===================================== |
| 42 | |
| 43 | For more details refer to Documentation/admin-guide/iostats.rst |