Messages in this thread | | | Date | Wed, 23 Aug 2006 11:22:31 -0700 | From | Hans Reiser <> | Subject | Re: [patch 4/5] fail-injection capability for disk IO |
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Andrew Morton wrote: > On Wed, 23 Aug 2006 14:03:55 +0200 > Jens Axboe <axboe@suse.de> wrote: > > >> On Wed, Aug 23 2006, Akinobu Mita wrote: >> >>> This patch provides fail-injection capability for disk IO. >>> >>> Boot option: >>> >>> fail_make_request=<probability>,<interval>,<times>,<space> >>> >>> <probability> >>> >>> specifies how often it should fail in percent. >>> >>> <interval> >>> >>> specifies the interval of failures. >>> >>> <times> >>> >>> specifies how many times failures may happen at most. >>> >>> <space> >>> >>> specifies the size of free space where disk IO can be issued >>> safely in bytes. >>> >>> Example: >>> >>> fail_make_request=100,10,-1,0 >>> >>> generic_make_request() fails once per 10 times. >>> >> Hmm dunno, seems a pretty useless feature to me. >> > > We need it. What is the FS/VFS/VM behaviour in the presence of IO > errors? Nobody knows, because we rarely test it. Those few times where > people _do_ test it (the hard way), bad things tend to happen. reiserfs > (for example) likes to go wobble, wobble, wobble, BUG. > The iron folks tested it, and we did better than other FS's. That said, it seems like a valuable feature to me. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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