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imported>ThorstenStaerk |
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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.
| + | #REDIRECT [[Tcpdump]] |
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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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| − | [[Category:geeky]][[Category:analysis]]
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Latest revision as of 17:13, 17 December 2013
