From mboxrd@z Thu Jan 1 00:00:00 1970 From: Edward Shishkin Subject: Re: bad block management Date: Wed, 02 Apr 2008 02:11:18 +0400 Message-ID: <47F2B306.6060202@gmail.com> References: <16413477.post@talk.nabble.com> <47F28DE5.1060402@emc.com> <47F29257.3000502@suse.com> Mime-Version: 1.0 Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <47F29257.3000502@suse.com> Sender: reiserfs-devel-owner@vger.kernel.org List-ID: Content-Type: text/plain; charset="us-ascii"; format="flowed" To: Jeff Mahoney Cc: ric@emc.com, Christian Kujau , kgp , reiserfs-devel@vger.kernel.org Jeff Mahoney wrote: > Ric Wheeler wrote: > > >Christian Kujau wrote: > > >>On Mon, 31 Mar 2008, kgp wrote: > >> > >>>How ReiserFS manages bad blocks? > >> > >>Is reiserfsck's --badblocks option helpful? > >> > >>>If it is not supporting bad block management, plz tell me the > >>>approches we > >>>can use to implement bad block management in any file system. I am > >>>implementing bad block manager for UDF. I want some inputs > >> > >>Doesn't "Spared UDF" already provide some kind of bad block management? > >> > >>C. > > >I am not sure what you want to do with bad block management. > > >With most modern disk drives, they will remap bad disk sectors > >dynamically for you so the file system layer can stay out of the bad > >block mapping business entirely. > > > He's asking about UDF, though, so I'd imagine he's talking about optical > media. It's even cheaper than disk though, so I guess I don't see the > benefit. > > Reiserfs handles bad blocks by allocating the blocks input as "known > bad" to special file that's inaccessible. It does _not_ do this > automatically, and reiserfsck/mkreiserfs must be passed a list of blocks > to allocate to that file. It also doesn't recover files that have been > corrupted to the block failure. Here are the instructions: http://chichkin_i.zelnet.ru/bad-block-handling.html > > Ric's right about disk drives, though. They'll remap the bad sectors > automatically at the hardware level. When you start to see bad sectors > at the file system level, it means that the sectors reserved for > remapping have been exhausted and you should replace the disk. > > -Jeff > > -- > Jeff Mahoney > SUSE Labs -- To unsubscribe from this list: send the line "unsubscribe reiserfs-devel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html