Date: Mon, 08 Mar 2010 14:29:10 +0100 From: Miroslav Lachman <000.fbsd@quip.cz> To: freebsd-current@freebsd.org Subject: Re: A tool for remapping bad sectors in CURRENT? Message-ID: <4B94FBA6.5090107@quip.cz> In-Reply-To: <20100308115052.GA31896@office.redwerk.com> References: <20100308102918.GA5485@localhost> <4B94DDC8.5080008@quip.cz> <20100308115052.GA31896@office.redwerk.com>
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Eugene Dzhurinsky wrote: > On Mon, Mar 08, 2010 at 12:21:44PM +0100, Miroslav Lachman wrote: >> Eugeny N Dzhurinsky wrote: >> We have this problem from time to time on bunch of machines. As we are >> using gmirror, the easiest way is to force re-synchronization (rewrite) >> of the whole drive. The problem is when there are Pending unreadable >> sectors on both drives - it ends up with read error and some file(s) are >> corrupted, but there is no easy way (on FreeBSD) to find what file. >> >> I tried it in the past with fsdb / findblk, but it does not work as I >> expect or I do not fully understand the needed calculations with slices >> + partitions offsets / LBAs and right meaning of the term "block". It >> seems there are several meaning in different contexts. >> >> It would be nice if somebody with enough FS / GEOM knowledge can write >> some HowTo or shell script to do the calculations and operations to find >> file containing bad sector(s) and put it in FAQ, Handbook, or Wiki. > > > Miroslav, thank you for the suggestion - but I am not using gmirror, that HDD > is the one on my laptop. However suggestions about using dd to write something > into bad block to force IDE controller do it's service stuff about remapping > seems did the trick. And I was able to not calculate LBA but use it as block > offset, which seemed to be correct way :) Yes, rewriting by dd or any other way works for reallocating or clearing pending sectors counter, but in server environment I need to know the affected file, as it can be for example database file and then it is a big problem! Rewriting the sector inside InnoDB ib_data file can cause DB crash, data loss etc. Miroslav Lachman
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