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Re: xfs_growfs doesn't resize (update)

To: xfs@xxxxxxxxxxx
Subject: Re: xfs_growfs doesn't resize (update)
From: Keith Keller <kkeller@xxxxxxxxx>
Date: Mon, 25 Jul 2011 11:28:51 -0700
In-reply-to: <20110720190819.GA14910@xxxxxxxxx>
References: <20110707182532.GA31319@xxxxxxxxx> <4E160A34.20902@xxxxxxxxxxx> <20110707222350.GA776@xxxxxxxxx> <4E163396.2010707@xxxxxxxxxxx> <20110720190819.GA14910@xxxxxxxxx>
User-agent: Mutt/
Hi again all,

I thought about this a bit more over the past few days, and did 
some more testing this morning.  I am currently thinking that I
really don't have as many paths to follow as I originally thought.

It seems like, whether I modify sb 0 with xfs_db or not, xfs_repair
still wants to see an 11TB filesystem--I did an mdrestore and mount
on the metadump image, which saw a 21TB filesystem, then did a umount
and xfs_repair, which modified the superblock.  On mounting again, the
filesystem was back to 11TB.  So I think there must be a definite
risk of data loss if I try to mount what the latest kernel thinks is
a 21TB filesystem, then need to run a repair at a later date, and
therefore I have to run an xfs_repair before trying to use the new
free space.

So, here is what I think is my plan for the actual filesystem:

--take another backup
--umount all XFS filesystems (the OS filesystems are ext3)
--remove the kmod-xfs CentOS package
--update to the latest CentOS kernel and reboot, making sure
  the target XFS fs does not have a mount attempted
--run xfs_repair from xfsprogs-3.1.5
--cross fingers :)
--mount and check what's in lost+found
--if all seems well, attempt another xfs_growfs using xfsprogs-3.1.5

Does this seem like a reasonable plan of attack?  If so, is there
a way to estimate how long the actual xfs_repair will take from my
xfs_repair sessions on the metadump image?  Obviously the hardware
isn't the same, but I'd just hope for a back of the envelope estimate,
not necessarily something terribly accurate.

Finally, are there other things I can try on the metadump image first
to give me more information on what'll happen on the live filesystem?

Thanks again!



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