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