From mboxrd@z Thu Jan 1 00:00:00 1970 From: Dan Christensen Subject: Re: devices get kicked from RAID about once a month Date: Thu, 03 Jun 2010 12:47:39 -0400 Message-ID: <87eigom5as.fsf@uwo.ca> References: <87k4qho723.fsf@uwo.ca> <628039470-1275491015-cardhu_decombobulator_blackberry.rim.net-326486810-@bda837.bisx.prod.on.blackberry> <876321o3lm.fsf@uwo.ca> <4C067AD6.7040700@anonymous.org.uk> <871vcpo0n6.fsf@uwo.ca> <4C069813.3010308@tmr.com> <87sk55mijx.fsf@uwo.ca> <4C07DA4E.70501@tmr.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Sender: linux-raid-owner@vger.kernel.org To: linux-raid@vger.kernel.org List-Id: linux-raid.ids Bill Davidsen writes: > Those logs don't show any information useful to me which tells me how > long md waited, and I'm not able to parse any of the res: information > to gain clarity. It would be nice if someone can parse that, but I > can't. On timeout an elapsed time output would be nice to indicate > what the time limit is. I agree. It would also be nice to know whether there was in fact a read error at that time (in which case I may just replace the drives to avoid this problem) or whether it was some other communications glitch (in which case I may suspect the power supply, try a newer kernel, etc). With the information at hand, I'm not sure how to fix this, and since it often is a month or more between occurrences, trial and error is not likely to help. > I sure would like to see a timeout in ms [md?] in > the /sys for the device and a flag for the array to not kick a drive > for timeout until some number of consecutive timeouts have > occurred. That could be useful. And, as Neil said, if the SATA driver could be told to use longer timeouts, that might help. Neil, if you think that's a good idea, maybe you could put the request in with the SATA folks? > I would hope that a drive with multiple partitions would get the > partitions kicked, not the whole drive at once. So one slow sector > wouldn't take out multiple arrays. Only the partition gets kicked out. Yesterday, this saved me, since I had timeouts on two drives in RAID5, but all the arrays stayed up because the partitions didn't happen to be in the same array. Dan