Problems replacing failing drive in ZFS pool

[Joshua Boyd]

On Wed, Jul 21, 2010 at 1:57 AM, alan bryan <alanbryan1234 at yahoo.com> wrote:

>
>
> --- On Mon, 7/19/10, Dan Langille <dan at langille.org> wrote:
>
> > From: Dan Langille <dan at langille.org>
> > Subject: Re: Problems replacing failing drive in ZFS pool
> > To: "Freddie Cash" <fjwcash at gmail.com>
> > Cc: "freebsd-stable" <freebsd-stable at freebsd.org>
> > Date: Monday, July 19, 2010, 7:07 PM
> > On 7/19/2010 12:15 PM, Freddie Cash
> > wrote:
> > > On Mon, Jul 19, 2010 at 8:56 AM, Garrett Moore<garrettmoore at gmail.com
> >
> > wrote:
> > >> So you think it's because when I switch from the
> > old disk to the new disk,
> > >> ZFS doesn't realize the disk has changed, and
> > thinks the data is just
> > >> corrupt now? Even if that happens, shouldn't the
> > pool still be available,
> > >> since it's RAIDZ1 and only one disk has gone
> > away?
> > >
> > > I think it's because you pull the old drive, boot with
> > the new drive,
> > > the controller re-numbers all the devices (ie da3 is
> > now da2, da2 is
> > > now da1, da1 is now da0, da0 is now da6, etc), and ZFS
> > thinks that all
> > > the drives have changed, thus corrupting the
> > pool.  I've had this
> > > happen on our storage servers a couple of times before
> > I started using
> > > glabel(8) on all our drives (dead drive on RAID
> > controller, remove
> > > drive, reboot for whatever reason, all device nodes
> > are renumbered,
> > > everything goes kablooey).
> >
> > Can you explain a bit about how you use glabel(8) in
> > conjunction with ZFS?  If I can retrofit this into an
> > exist ZFS array to make things easier in the future...
> >
> > 8.0-STABLE #0: Fri Mar  5 00:46:11 EST 2010
> >
> > ]# zpool status
> >   pool: storage
> >  state: ONLINE
> >  scrub: none requested
> > config:
> >
> >         NAME
> > STATE     READ WRITE CKSUM
> >         storage
> >    ONLINE
> >    0     0
> >    0
> >           raidz1
> > ONLINE       0
> >    0     0
> >             ad8
> >    ONLINE
> >    0     0
> >    0
> >             ad10
> > ONLINE       0
> >    0     0
> >             ad12
> > ONLINE       0
> >    0     0
> >             ad14
> > ONLINE       0
> >    0     0
> >             ad16
> > ONLINE       0
> >    0     0
> >
> > > Of course, always have good backups.  ;)
> >
> > In my case, this ZFS array is the backup.  ;)
> >
> > But I'm setting up a tape library, real soon now....
> >
> > -- Dan Langille - http://langille.org/
> > _______________________________________________
> > freebsd-stable at freebsd.org
> > mailing list
> > http://lists.freebsd.org/mailman/listinfo/freebsd-stable
> > To unsubscribe, send any mail to "freebsd-stable-unsubscribe at freebsd.org
> "
> >
>
> Dan,
>
> Here's how to do it after the fact:
>
>
> http://unix.derkeiler.com/Mailing-Lists/FreeBSD/current/2009-07/msg00623.html
>
> --Alan Bryan
>

[root at foghornleghorn ~]# glabel label disk01 /dev/da0
glabel: Can't store metadata on /dev/da0: Operation not permitted.

Hrmph.


>
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-- 
Joshua Boyd
JBipNet

E-mail: boydjd at jbip.net

http://www.jbip.net