As a one-time disk rescuer, let me mention that 'dd' is your friend.
Mehma
===
On 11/3/10 3:16 PM, Mark Luntzel wrote:
> On Wed, Nov 3, 2010 at 2:50 PM, Phil Stracchino<alaric AT metrocast DOT net>
> wrote:
>
>> On 11/03/10 13:34, Mark Luntzel wrote:
>>
>>> The answer is probably no but...
>>>
>>> I can hear the disk currently being written to making bad noises, and
>>> the speed is extremely slow. Bad disk for sure, about to fail. This is
>>> at the end of a multi-Terabyte backup, just about 500 gig left and I
>>> would REALLY hate to think there is no way out but to start over
>>> completely.
>>>
>>> So is there a way for me to replace that disk without invalidating the
>>> entire backup? Running on Linux with an external SATA / FW enclosure,
>>> bacula version 3.0.2
>>>
>> If it's mirrored, or part of any RAID1 or higher configuration, you can
>> swap out the failed disk and rebuild the mirror. If it is a single,
>> unmirrored disk ... sorry, but if it's failed, you're SOL.
>> Check the disk with smartmontools or similar before you assume it's bad,
>> and check your kernel logs for write failures. Is it possible it's just
>> thrashing?
>>
> Just to clear up confusion, I am talking about the disk being *written
> to*. It is not in a RAID, it is just in an external SATA/FW enclosure.
> Since I cannot yet (AFAIK) send SMART commands across the USB/FW bus,
> I had to settle with xfs_check. Which caused the disk to again make
> bad clunking noises and output btree block errors. This could just
> indicate filesystem corruption, but the question is moot for the
> purposes of this particular job.
>
> I hit the IRC channel up, and after discussing the issue with the fine
> folks there, came to the conclusion that I am indeed SOL. Maybe its on
> a list of "would be nice to have" already, but I sure would have liked
> to not have had to invalidate the whole job on account of one bad
> volume.
>
> Thanks for taking the time to reply, sincerely!
>
> -- Mark
>
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