RAID & HDD failure recovery

[David G. Miller]

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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