RAID & HDD failure recovery
David G. Miller
dave at davenjudy.org
Sat Nov 18 02:38:26 UTC 2006
Mike McCarty <Mike.McCarty at sbcglobal.net> wrote:
> David G. Miller wrote:
>
> [snip]
>
>
>> > I think the only data loss was during the period of time from when the
>> > drive failed until I was able to pull the ribbon cable. Unfortunately,
>> > the system was still trying to write to the dead drive.
>>
>
> There should have been no data loss. If RAID works correctly, and you
> have fewer failures than the array is designed to accept, there should
> be no, emphasized no data loss.
>
> [snip]
>
> Mike
I agree and that probably would have been the case if the drive had
cleanly died. The problem was it died a slow death.
RAID kept trying to write data to the drive which is why I described the
system as being "wonky." It sort of worked but any I/O to/from the
array that included the bad drive took a long time due to the drive
errors. I finally decided that trying to let the system synchronize
would be worse than just "pulling the plug" so I forced a shutdown.
Luckily, it was a weekend and all that was lost were a few spams and
some cron status e-mails. I'd already checked that this was the case
when decided to force the reboot.
Cheers,
Dave
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