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Date: Sun, 04 Oct 2009 10:50:07 +0200
From: Michael Fuckner <michael@fuckner.net>
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To: Patrick Proniewski <patpro@patpro.net>
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Cc: freebsd-fs@freebsd.org
Subject: Re: Offline uncorrectable sectors on hard drive
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Patrick Proniewski wrote:
> Hi all,
Hi Patrick,

> ../..
>> Oct  4 01:34:19 rack smartd[739]: Device: /dev/ad6, 1 Offline 
>> uncorrectable sectors
>> Oct  4 02:04:19 rack smartd[739]: Device: /dev/ad6, 1 Offline 
>> uncorrectable sectors
> 
> first error flagged Oct 3 04:04:19, last error Oct 4 02:04:19. Since 
> then, no more error in the logs.
This looks like a bad drive


> So my questions are:
> 
> - is that "Offline uncorrectable sectors" in fact correctable? I've 
> found howto's for extfs and reiserfs to correct this kind of error by 
> remapping bad sectors, but nothing for UFS.
> - this error appears to have disappeared, does it mean the harddrive (or 
> the fs) made the remapping by it self?
sector errors are on the hardware, they don't deal with the filesystem.

Perhaps it was a once in a lifetime event, perhaps the drive is going to 
die really soon.

Please do a smartctl -t long and see if the drive has to be replaced.

Regards,
  Michael!