ad0: TIMEOUT - Is my disk dying?

[Jerry McAllister]

On Fri, Mar 30, 2007 at 09:15:19AM +0200, Guido Demmenie wrote:

> 
> On Mar 30, 2007, at 9:09 AM, Wood, Russell wrote:
> 
> >>-----Original Message-----
> >>From: owner-freebsd-questions at freebsd.org [mailto:owner-freebsd-
> >>questions at freebsd.org] On Behalf Of Guido Demmenie
> >>Sent: Friday, 30 March 2007 3:00 PM
> >>To: Christian Walther
> >>Cc: FreeBSD Users Questions
> >>Subject: Re: ad0: TIMEOUT - Is my disk dying?
> >>
> >>
> >>On Mar 29, 2007, at 11:20 PM, Christian Walther wrote:
> >>
> >>>Hi,
> >>>
> >>>I'm seeing a lot of the following messages lately:
> >>>
> >>>Mar 29 21:02:01 pixie kernel: ad0: TIMEOUT - READ_DMA retrying (1
> >>>retry left) LBA=13554983
> >>>Mar 29 21:02:34 pixie kernel: ad0: TIMEOUT - READ_DMA retrying (1
> >>>retry left) LBA=35376691
> >>>
> >>
> >>You also might want to give smartmontools a try. This can be found
> >>in the portscollection (sysutils/smartmontools). This will query
> >>the SMART tool built in most IDE drives. You can let the harddrive
> >>do a selfcheck. And gather some statistics from your drive.
> >>
> >>--
> >>Guido
> >
> >When you have a suspected faulty hard drive, the last thing you  
> >want to
> >do is use it.
> 
> >- Russell
> 
> Can you tell me why?

Because it will potentially make it fail totally sooner.
Hard disk failures tend to be rapidly progressive once
they get bad enough to start showing up in messages.
You want to get your important stuff off it as soon as possible
and certainly without encouraging the disk to die before
that can be done.    Once you have made sure of your important
data, then go ahead and play with it and see what you can find out.

////jerry

> 
> --
> Guido
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