Date: Tue, 20 Jul 2010 22:57:25 -0700 (PDT) From: alan bryan <alanbryan1234@yahoo.com> To: Freddie Cash <fjwcash@gmail.com>, Dan Langille <dan@langille.org> Cc: freebsd-stable <freebsd-stable@freebsd.org> Subject: Re: Problems replacing failing drive in ZFS pool Message-ID: <578438.38753.qm@web50502.mail.re2.yahoo.com> In-Reply-To: <4C4504DF.30602@langille.org>
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--- On Mon, 7/19/10, Dan Langille <dan@langille.org> wrote: > From: Dan Langille <dan@langille.org> > Subject: Re: Problems replacing failing drive in ZFS pool > To: "Freddie Cash" <fjwcash@gmail.com> > Cc: "freebsd-stable" <freebsd-stable@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@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@freebsd.org > mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-stable > To unsubscribe, send any mail to "freebsd-stable-unsubscribe@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 Bryanhelp
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