0001 What: /proc/diskstats
0002 Date: February 2008
0003 Contact: Jerome Marchand <jmarchan@redhat.com>
0004 Description:
0005 The /proc/diskstats file displays the I/O statistics
0006 of block devices. Each line contains the following 14
0007 fields:
0008
0009 == ===================================
0010 1 major number
0011 2 minor mumber
0012 3 device name
0013 4 reads completed successfully
0014 5 reads merged
0015 6 sectors read
0016 7 time spent reading (ms)
0017 8 writes completed
0018 9 writes merged
0019 10 sectors written
0020 11 time spent writing (ms)
0021 12 I/Os currently in progress
0022 13 time spent doing I/Os (ms)
0023 14 weighted time spent doing I/Os (ms)
0024 == ===================================
0025
0026 Kernel 4.18+ appends four more fields for discard
0027 tracking putting the total at 18:
0028
0029 == ===================================
0030 15 discards completed successfully
0031 16 discards merged
0032 17 sectors discarded
0033 18 time spent discarding
0034 == ===================================
0035
0036 Kernel 5.5+ appends two more fields for flush requests:
0037
0038 == =====================================
0039 19 flush requests completed successfully
0040 20 time spent flushing
0041 == =====================================
0042
0043 For more details refer to Documentation/admin-guide/iostats.rst
