Messages in this thread | | | Date | Wed, 23 Aug 2006 15:42:44 -0400 | From | Ric Wheeler <> | Subject | Re: [patch 4/5] fail-injection capability for disk IO |
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Mario 'BitKoenig' Holbe wrote: > Jens Axboe <axboe@suse.de> wrote: > >>On Wed, Aug 23 2006, Andi Kleen wrote: >> >>>I think I would prefer a stackable driver instead of this hook. > > > I second this, preferrably a device-mapper target similar to dm-error. > > >>But that makes it more tricky to setup a test, since you have to change >>from using /dev/sda (for example) to /dev/stacked-driver. > > > Do you really think somebody would run such tests on otherwise normally > used devices? >
We certainly run this kind of tests on a routine basis - before we ship a kernel to our installed field, we need to verify that it will handle disk IO errors correctly.
In our case, the tests are run on a farm of machines that get pxe'ed to a specific image, tested (usually by sticking in a disk known to be bad enough to cause reliable errors ;-)) and then we watch to see that the errors do not cause hangs, etc.
Having a requirement to change our standard image (sda -> stacked-driver) would not be impossible, but would be less convenient...
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