Re: How to un-degrade an array after a totally spurious failure?

On Sun Jun 07, 2009 at 08:56:42PM -0500, Leslie Rhorer wrote:

quoted

-----Original Message-----
From: linux-raid-owner@vger.kernel.org [mailto:linux-raid-
owner@vger.kernel.org] On Behalf Of Carlos Carvalho
Sent: Sunday, June 07, 2009 8:54 PM
To: linux-raid@vger.kernel.org
Subject: RE: How to un-degrade an array after a totally spurious failure?

Leslie Rhorer (lrhorer@satx.rr.com) wrote on 7 June 2009 20:43:
 >OK, what about a RAID 6 array with one failed disk?  Is the remove & add
 >the best option there, or should one apply a different method?

It is, since that's what the raid is for. It's still operational.
We've done it here and it works.

Well, yes, I know it should work.  The question is, "Is it the best method?"

Yes - as the array is still active then it's likely to have changed
since the drive failed.  This means that stopping the array and
re-assembling, forcing the failed drive active, could lead to
corruption.  Removing & adding it will ensure the data is updated to
match the current array state.

Of course, neither option should be pursued unless you know _exactly_
why the drive failed and know that it's safe to re-add it to the array.

Cheers,
    Robin
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