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Date: Mon, 28 Nov 2005 03:14:40 -0500
From: Kris Kennaway <kris@obsecurity.org>
To: Mike Spooner <spooner@scripps.edu>
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Cc: freebsd-stable@freebsd.org
Subject: Re: power outage
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On Mon, Nov 28, 2005 at 12:05:18AM -0800, Mike Spooner wrote:
> I didn't know if I should post this to questions or stable but here it
> is...
>=20
> We had a power outage and now /home won't mount.  Before the power outage
> all was fine.

Looks like the drive became damaged.  Maybe the power spiked (invest
in a UPS for next time :)

> ad1: FAILURE - READ_DMA status=3D51<READY,DSC,ERROR> error=3D40<UNCORRECT=
ABLE>
> LBA=3D69103423
>=20
> CANNOT READ BLK: 54947584

> ad1: FAILURE - READ_DMA status=3D51<READY,DSC,ERROR> error=3D40<UNCORRECT=
ABLE>
> LBA=3D69103423
> ad1: FAILURE - READ_DMA status=3D51<READY,DSC,ERROR> error=3D40<UNCORRECT=
ABLE>
> LBA=3D69103445
> THE FOLLOWING DISK SECTORS COULD NOT BE READ: 54947584, 54947606,

Mount the drive read-only, copy off whatever data you can, and then if
you're lucky you may be able to recover the use of the drive if you
scrub it with dd if=3D/dev/zero of=3D/dev/ad1, but of course this will
destroy all data.

Kris


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