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Re: mount failed after xfs_growfs beyond 16 TB

To: Christian Guggenberger <christian.guggenberger@xxxxxxxxxxxxxxxxxxxxxxxx>
Subject: Re: mount failed after xfs_growfs beyond 16 TB
From: David Chinner <dgc@xxxxxxx>
Date: Tue, 7 Nov 2006 19:17:48 +1100
Cc: David Chinner <dgc@xxxxxxx>, Eric Sandeen <sandeen@xxxxxxxxxxx>, xfs@xxxxxxxxxxx
In-reply-to: <20061103154448.GA26647@pc51072.physik.uni-regensburg.de>
References: <20061102172608.GA27769@pc51072.physik.uni-regensburg.de> <454A3B28.7010405@sandeen.net> <20061103093203.GA18010@pc51072.physik.uni-regensburg.de> <20061103123418.GP8394166@melbourne.sgi.com> <20061103154448.GA26647@pc51072.physik.uni-regensburg.de>
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On Fri, Nov 03, 2006 at 04:44:48PM +0100, Christian Guggenberger wrote:
> > The superblock:
> > 
> > blocksize = 4096
> > dblocks = 18446744070056148512
> > ...
> > agblocks = 84976608
> > agcount = 570
> > 
> > An AG is ~43.5GB, so 570 AGs is 24.8TB. It's to big, and
> > we will only shrink by whole AGs. Hence we have to correct
> > agcount and dblocks.
> 
> isn't the AG size 'agblocks * blocksize' == ~324 GB here ?

Yes, you are right - I was thinking 512 byte blocks which
then gave the right size that you grew to. Otherwise 570*324GB
gives 200TB, which is somewhat larger than you apparently tried
to grow to...

Sorry for the misdirection, but I'm glad to see that you got
it fixed.

Cheers,

Dave.
-- 
Dave Chinner
Principal Engineer
SGI Australian Software Group


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