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Date: Fri, 3 Sep 2010 09:55:59 -0400 (Eastern Daylight Time)
From: Xihong Yin <xyin@gmx.com>
To: Lowell Gilbert <freebsd-questions-local@be-well.ilk.org>
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Cc: Mike Jeays <mike.jeays@rogers.com>, freebsd-questions@freebsd.org
Subject: Re: error - ad2: FAILURE
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Thanks for the info. Now I am getting more such error messages and the
disk fails at boot when trying to mount on /usr.

Xihong


On Thu, 2 Sep 2010, Lowell Gilbert wrote:

> Mike Jeays <mike.jeays@rogers.com> writes:
>
>> On September 1, 2010 10:29:42 pm Xihong Yin wrote:
>>> Hi,
>>>
>>> I received the following error when I try to access files in some of the
>>> directories in /usr and when the computer boots. ad2s1f is mounted on
>>> /usr.
>>>
>>> ad2: FAILURE - READ_DMA status=51<READY,DSC,ERROR> error=40<UNCORRECTABLE>
>>> LBA=37370159 g_vfs_done():ad2s1f[READ(offset=15415558144,
>>> length=16384)]error = 5
>>>
>>> Is this a sign of hard drive failure? Can I fix the error or do I have to
>>> replace the hard drive?
>
>> I would think it is a hardware error, and the disk has run out of replacement
>> sectors. If possible, it should be replaced, and any valuable data copied to
>> somewhere safe, as soon as possible.
>
> Not necessarily.  This is a read error, so replacement sectors wouldn't
> help anyway.  The problematic files might get fixed by the disk if they
> were rewritten.  A SMART report (e.g., from sysutils/smartmontools)
> might give more information about the condition of the drive.
>
> None of which is to say that it isn't worrying, or that backing up
> valuable data isn't called for (even more so than usual).  Make sure you
> have good backups before you do anything else.
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