Re: Failed Array Rebuild advice Please

[NeilBrown <neilb@suse.de>]

[-- Attachment #1: Type: text/plain, Size: 1297 bytes --]

On Tue, 10 Apr 2012 21:14:07 -0700 (PDT) jahammonds prost
<gmitch64@yahoo.com> wrote:

> One other question as the badblocks progresses.
>  
> >  It will then recovery both devices in parallel.
> 
> How many additional devices can be done at the same time? I presume that I am going to have to replace the 2 failed devices before I try and grow the array by adding 3 additional drives? I so, how many additional drives can be rebuilt concurrently with a grow? Could I add 5 devices and not see too much of a performance hit? Or would it be more sensible to add them one at a time?
> 

I think it is best to recover, and then reshape later.  I cannot promise that
doing them both at once will work .... it might but I have a feeling that
there might be problems.

Adding three additional drives at once should work well enough in terms of
performance.
However I would only do it if I were very very confident of the drives.
If you hit bad blocks you start losing drives, and if you have 3 drives that
you haven't used before, the chance of losing them all during the reshape -
while still small - becomes a little too high for comfort.

But if you have run heavy bad-blocks tests on them all and they appear to
work, then adding 3 drives at once should be fine.

NeilBrown

[-- Attachment #2: signature.asc --]
[-- Type: application/pgp-signature, Size: 828 bytes --]