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Re: xfs_growfs doesn't resize

To: <xfs@xxxxxxxxxxx>
Subject: Re: xfs_growfs doesn't resize
From: kkeller@xxxxxxxxx
Date: Sun, 03 Jul 2011 12:42:59 -0700
Cc: "Eric Sandeen" <sandeen@xxxxxxxxxxx>
Reply-to: kkeller@xxxxxxxxx
On Sun, Jul 03, 2011 at 10:59:03AM -0500, Eric Sandeen wrote:
> On 6/30/11 4:42 PM, kkeller@xxxxxxxxx wrote:
> > # uname -a
> > Linux sahara.xxx 2.6.18-128.1.6.el5 #1 SMP Wed Apr 1 09:10:25 EDT 2009 
> > x86_64 x86_64 x86_64 GNU/Linux
> > 
> > Yes, it's not a completely current kernel. This box is running CentOS 5
> > with some yum updates.
> try
> # rpm -qa | grep xfs
> If you see anything with "kmod" you're running an exceptionally old xfs 
> codebase.

Yes, I do have a kmod-xfs package, so clearly a kernel update is in
order. So my goals are twofold: 1) verify the current filesystem's
state--is it healthy, or does it need xfs_db voodoo? 2) once it's
determined healthy, again attempt to grow the filesystem. Here is
my current plan for reaching these goals:

0) get a nearer-term backup, just in case :) The filesystem still seems
perfectly normal, but without knowing what my first xfs_growfs did I
don't know if or how long this state will last.

1) umount the fs to run xfs_db

2) attempt a remount--is this safe, or is there risk of damaging the filesystem?

3) If a remount succeeds, then update the kernel and xfsprogs. If a remount
doesn't work, then revert to the near-term backup I took in 0) and attempt
to fix the issue (with the help of the list, I hope).

4) In either case, post my xfs_db output to the list and get your
opinions on the health of the fs.

5) If the fs seems correct, attempt xfs_growfs again.

Do all these steps seem reasonable? I am most concerned about step 2--
I really do want to be able to remount as quickly as possible, but I
do not know how to tell whether it's okay from xfs_db's output. So if a
remount attempt is reasonably nondestructive (i.e., it won't make worse
an already unhealthy XFS fs) then I can try it and hope for the best.
(From the other threads I've seen it seems like it's not a good idea to
run xfs_repair.)

Would it make more sense to update the kernel and xfsprogs before
attempting a remount? If a remount fails under the original kernel,
what do people think the odds are that a new kernel would be able to
mount the original fs, or is that really unwise?

Again, many thanks for all your help.



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