Date: Sat, 7 Oct 2000 09:58:23 +0200 (CEST) From: Remy Nonnenmacher <remy@boostworks.com> To: jedgar@fxp.org Cc: dest@syd.eastlink.ca, freebsd-stable@FreeBSD.ORG Subject: Re: Bad IDE Drive Message-ID: <200010070757.JAA39707@luxren2.boostworks.com> In-Reply-To: <20001006152247.B82507@pawn.primelocation.net>
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On 6 Oct, Chris Faulhaber wrote: > On Fri, Oct 06, 2000 at 04:14:38PM -0300, Craig Hawco wrote: >> Hello, >> >> I have recently fled from FreeBSD back into (ugh) windows because of a >> minor drive problem. It seems that my drive has a few bad blocks, and I >> know what they are. FreeBSD seems to try to write to the same bad sectors >> every time, and keeps printing errors that it can't write to the block, etc >> etc. The thing is it's the same few (about a dozen) sectors, about 8/10ths >> the way through the drive. I could use only up to that amount, but that >> doesn't seem like an elegant solution leaving a few hundred megs of empty >> space. Is there a way to have FreeBSD map the sectors and try to neither >> read nor write to them? It wouldn't be a problem (I can turn off syslog and >> get rid of the nasty messages ;) if it didn't cause the filesystem to >> become corrupted (fsck tries to read/fix the data on the bad spots and >> dies). Hope someone out there can help. >> > > Most modern IDE drives automatically remap bad sectors. If the drive can > no longer remap bad sectors itself, it is probably time to replace it. > Remapping works for IDE and SCSI but most of them remap only on a write operation, not on a read (Even is told to do so by ARRE for SCSI disks). This is intended to let you know that something is wrong, instead of silently reallocating a new zeroed sector and let you then, later, guess why your data are corrupted. Unfortunetly, this require you to overwrite the sector (and more generally the 8K block covering the sector(s), else the system will try to read in the block in buffers before writting and will fail the write). To get things worst, some disks succeed in rewritting and do not really relocate the sector, making a Damocles' sword of the problem. Thanks to camcontrol (or scsi(1)), you can force rellocation on SCSI disks pretty easily. RN. IeM To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message
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