Date: Mon, 19 Jul 2010 22:07:27 -0400 From: Dan Langille <dan@langille.org> To: Freddie Cash <fjwcash@gmail.com> Cc: freebsd-stable <freebsd-stable@freebsd.org> Subject: Re: Problems replacing failing drive in ZFS pool Message-ID: <4C4504DF.30602@langille.org> In-Reply-To: <AANLkTillT4yA5EJtcFUyhCUtD7b14u1n7svv02Y2IcqL@mail.gmail.com> References: <AANLkTimOrwHe7xiwoap2H2mUtA7vU6TjENkPC4yJ02_z@mail.gmail.com> <AANLkTimOIgCIO4txpPeeoMrRSYAqM25V7cm-h7djmZUC@mail.gmail.com> <AANLkTikPOgIqkm3GhIsEnvuvEHvlc44cnh6GJQ1k7Ja_@mail.gmail.com> <AANLkTillT4yA5EJtcFUyhCUtD7b14u1n7svv02Y2IcqL@mail.gmail.com>
next in thread | previous in thread | raw e-mail | index | archive | help
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/
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?4C4504DF.30602>