Date: Tue, 24 Apr 2012 12:25:21 -0700 From: George Hartzell <hartzell@alerce.com> To: Johannes Totz <johannes@jo-t.de> Cc: freebsd-fs@freebsd.org Subject: Re: Increasing ZFS Disk Sizes Message-ID: <20374.65057.207126.29371@gargle.gargle.HOWL> In-Reply-To: <jn6b8m$3k5$1@dough.gmane.org> References: <CACMcHMdCaJjE1Ao7jN156tK%2ByNHDCyEZ-wam489jq2JhCJd%2BnA@mail.gmail.com> <4F964429.5060607@infracaninophile.co.uk> <jn6b8m$3k5$1@dough.gmane.org>
next in thread | previous in thread | raw e-mail | index | archive | help
Johannes Totz writes:
> On 24/04/2012 07:11, Matthew Seaman wrote:
> > On 24/04/2012 04:22, Tim Gustafson wrote:
> >> Am I missing anything here, or is the this "safe" way to do this? Do
> >> I need to do anything special (other than the gpart bootcode command)
> >> to make the new disk bootable? Do I need to do anything special to
> >> set up the swap partition? Right now, I have this in my /etc/fstab:
> >
> > Yes, this is a good way to do this change. The only better way would be
> > to add the 2TB disk to the mirror first -- thus making a three way
> > mirror, let that resilver, and then remove one of the old drives. But
> > that requires you to have available spare disk slots.
>
> Don't forget to scrub first.
> Also might want to consider a zpool split, instead of detach. So that
> you have two disks with usable data in case the to-be-resilvered-from
> disk dies unexpectedly.
> [...]
Be careful about the split, it seems to leave a bootable ZFS mirror
unbootable. I have a bug open (kern/166566) that Andriy Gapon is
looking into it. My understanding of the current suspect is that
GUID's are changed unexpected and/or inconsistently and/or
incompletely.
I seem to be able to fix the problem by booting via a live CD,
importing the pool and copying the resulting zpool.cache file to the
bootable pool, e.g.
zpool split zroot zsplitroot
# ... frustration ensues
boot live cd
zpool import # lists new pools, e.g. zroot and zsplitroot
zpool import -f -o cachefile=/tmp/zpool.cache \
-o altroot=/mnt zroot
mount -t zfs zroot /mnt # I don't have things automagically mount
cp /tmp/zpool.cache /mnt/boot/zfs/zpool.cache
reboot
g.
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?20374.65057.207126.29371>