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2026-09-06 12:53:21 -06:00
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linux-7.2.3/Documentation/ABI/testing/procfs-diskstats
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What: /proc/diskstats
Date: February 2008
Contact: Jerome Marchand <jmarchan@redhat.com>
Description:
The /proc/diskstats file displays the I/O statistics
of block devices. Each line contains the following 14
fields:
== ===================================
1 major number
2 minor number
3 device name
4 reads completed successfully
5 reads merged
6 sectors read
7 time spent reading (ms)
8 writes completed
9 writes merged
10 sectors written
11 time spent writing (ms)
12 I/Os currently in progress
13 time spent doing I/Os (ms)
14 weighted time spent doing I/Os (ms)
== ===================================
Kernel 4.18+ appends four more fields for discard
tracking putting the total at 18:
== ===================================
15 discards completed successfully
16 discards merged
17 sectors discarded
18 time spent discarding
== ===================================
Kernel 5.5+ appends two more fields for flush requests:
== =====================================
19 flush requests completed successfully
20 time spent flushing
== =====================================
For more details refer to Documentation/admin-guide/iostats.rst