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You can do I/O sniffing using the command blktrace. blktrace will show you every request that goes to the disk.
  
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Example:
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# blktrace -d /dev/sdg -o - | blkparse -i -
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[...]
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  <abbr title="device (major/minor number)">8,96</abbr>  <abbr title="processor">7</abbr>      <abbr title="sequence number">106</abbr>    <abbr title="timestamp">0.373952974</abbr> <abbr title="PID">11364</abbr>  <abbr title="Action/Event">D</abbr>  <abbr title="RWBS (D) field">W</abbr> <abbr title="starting block + blocks">0 + 8</abbr> <abbr title="process">[kworker/7:2]</abbr>
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  8,96  7      107    0.374456639    47  C  W 0 + 8 [0]
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The RWBS(D) field can be a combination of
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R : Read
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W : Write
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D : Block discard
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B : Barrier operation
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S : Synchronous operations
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= See also =
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* [http://linux.die.net/man/8/blktrace blktrace man page]
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* [http://linux.die.net/man/1/blkparse blkparse man page]
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* http://unix.stackexchange.com/questions/105610/how-does-blktrace-work
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* http://unix.stackexchange.com/questions/105612/why-does-blktrace-only-write-blocks-of-8
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[[Category:geeky]][[Category:analysis]]

Revision as of 14:51, 19 December 2013

You can do I/O sniffing using the command blktrace. blktrace will show you every request that goes to the disk.

Example:

# blktrace -d /dev/sdg -o - | blkparse -i - 
[...]
  8,96   7      106     0.373952974 11364  D   W 0 + 8 [kworker/7:2]
  8,96   7      107     0.374456639    47  C   W 0 + 8 [0]


The RWBS(D) field can be a combination of

R : Read
W : Write
D : Block discard
B : Barrier operation
S : Synchronous operations

See also

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