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authorLinus Torvalds <torvalds@linux-foundation.org>2011-03-25 20:51:44 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2011-03-25 20:51:44 -0700
commit44bbd7ac2658eb1118342493026ef141e259b739 (patch)
treea804d3503e48ee8b2bd0dd3c40235e482a75a512 /Documentation
parent24c6d02fe8c34bc958aa4c464efc1cc10d43e29d (diff)
parent29915202006c2e7bafe81348eb498ff9a724ac61 (diff)
Merge git://git.kernel.org/pub/scm/linux/kernel/git/agk/linux-2.6-dm
* git://git.kernel.org/pub/scm/linux/kernel/git/agk/linux-2.6-dm: dm stripe: implement merge method dm mpath: allow table load with no priority groups dm mpath: fail message ioctl if specified path is not valid dm ioctl: add flag to wipe buffers for secure data dm ioctl: prepare for crypt key wiping dm crypt: wipe keys string immediately after key is set dm: add flakey target dm: fix opening log and cow devices for read only tables
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/device-mapper/dm-flakey.txt17
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diff --git a/Documentation/device-mapper/dm-flakey.txt b/Documentation/device-mapper/dm-flakey.txt
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+dm-flakey
+=========
+
+This target is the same as the linear target except that it returns I/O
+errors periodically. It's been found useful in simulating failing
+devices for testing purposes.
+
+Starting from the time the table is loaded, the device is available for
+<up interval> seconds, then returns errors for <down interval> seconds,
+and then this cycle repeats.
+
+Parameters: <dev path> <offset> <up interval> <down interval>
+ <dev path>: Full pathname to the underlying block-device, or a
+ "major:minor" device-number.
+ <offset>: Starting sector within the device.
+ <up interval>: Number of seconds device is available.
+ <down interval>: Number of seconds device returns errors.