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