1 What: /proc/diskstats 1 What: /proc/diskstats
2 Date: February 2008 2 Date: February 2008
3 Contact: Jerome Marchand <jmarchan@redha 3 Contact: Jerome Marchand <jmarchan@redhat.com>
4 Description: 4 Description:
5 The /proc/diskstats file displ 5 The /proc/diskstats file displays the I/O statistics
6 of block devices. Each line co 6 of block devices. Each line contains the following 14
7 fields: 7 fields:
8 8
9 == ========================== !! 9 1 - major number
10 1 major number !! 10 2 - minor mumber
11 2 minor number !! 11 3 - device name
12 3 device name !! 12 4 - reads completed successfully
13 4 reads completed successful !! 13 5 - reads merged
14 5 reads merged !! 14 6 - sectors read
15 6 sectors read !! 15 7 - time spent reading (ms)
16 7 time spent reading (ms) !! 16 8 - writes completed
17 8 writes completed !! 17 9 - writes merged
18 9 writes merged !! 18 10 - sectors written
19 10 sectors written !! 19 11 - time spent writing (ms)
20 11 time spent writing (ms) !! 20 12 - I/Os currently in progress
21 12 I/Os currently in progress !! 21 13 - time spent doing I/Os (ms)
22 13 time spent doing I/Os (ms) !! 22 14 - weighted time spent doing I/Os (ms)
23 14 weighted time spent doing <<
24 == ========================== <<
25 23
26 Kernel 4.18+ appends four more 24 Kernel 4.18+ appends four more fields for discard
27 tracking putting the total at 25 tracking putting the total at 18:
28 26
29 == ========================== !! 27 15 - discards completed successfully
30 15 discards completed success !! 28 16 - discards merged
31 16 discards merged !! 29 17 - sectors discarded
32 17 sectors discarded !! 30 18 - time spent discarding
33 18 time spent discarding <<
34 == ========================== <<
35 31
36 Kernel 5.5+ appends two more f 32 Kernel 5.5+ appends two more fields for flush requests:
37 33
38 == ========================== !! 34 19 - flush requests completed successfully
39 19 flush requests completed s !! 35 20 - time spent flushing
40 20 time spent flushing <<
41 == ========================== <<
42 36
43 For more details refer to Docu 37 For more details refer to Documentation/admin-guide/iostats.rst
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