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 1 - major number
9 == ========================== !! 9 2 - minor mumber
10 1 major number !! 10 3 - device name
11 2 minor number !! 11 4 - reads completed successfully
12 3 device name !! 12 5 - reads merged
13 4 reads completed successful !! 13 6 - sectors read
14 5 reads merged !! 14 7 - time spent reading (ms)
15 6 sectors read !! 15 8 - writes completed
16 7 time spent reading (ms) !! 16 9 - writes merged
17 8 writes completed !! 17 10 - sectors written
18 9 writes merged !! 18 11 - time spent writing (ms)
19 10 sectors written !! 19 12 - I/Os currently in progress
20 11 time spent writing (ms) !! 20 13 - time spent doing I/Os (ms)
21 12 I/Os currently in progress !! 21 14 - weighted time spent doing I/Os (ms)
22 13 time spent doing I/Os (ms) !! 22 For more details refer to Documentation/iostats.txt
23 14 weighted time spent doing <<
24 == ========================== <<
25 <<
26 Kernel 4.18+ appends four more <<
27 tracking putting the total at <<
28 <<
29 == ========================== <<
30 15 discards completed success <<
31 16 discards merged <<
32 17 sectors discarded <<
33 18 time spent discarding <<
34 == ========================== <<
35 <<
36 Kernel 5.5+ appends two more f <<
37 <<
38 == ========================== <<
39 19 flush requests completed s <<
40 20 time spent flushing <<
41 == ========================== <<
42 <<
43 For more details refer to Docu <<
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