Date: Wed, 09 Mar 2005 17:43:49 -0500 From: Paul Mather <paul@gromit.dlib.vt.edu> To: Pawel Jakub Dawidek <pjd@freebsd.org> Cc: freebsd-geom@freebsd.org Subject: Re: gmirror metadata Message-ID: <1110408229.690.8.camel@zappa.Chelsea-Ct.Org> In-Reply-To: <20050309202225.GP9291@darkness.comp.waw.pl> References: <200503091503.33431.michael.riexinger@de.clara.net> <20050309202225.GP9291@darkness.comp.waw.pl>
next in thread | previous in thread | raw e-mail | index | archive | help
On Wed, 2005-03-09 at 21:22 +0100, Pawel Jakub Dawidek wrote:
> On Wed, Mar 09, 2005 at 03:03:33PM +0100, Michael Riexinger wrote:
> +> Hi,
> +>
> +> i have a hp dl320 with an integrated raid controller. I don't want to
> +> use that, instead i want to use gmirror. To use the 2 IDE drives, I
> +> configured 2 raid0 arrays (each with 1 drive) in the controller's bios.
> +> Now i wanted to use gmirror, labeled the second drive. When I did a
> +> reboot, the raid controller's bios seems to overwrite the gmirror
> +> metadata with its own metadata. Is it impossible to use gmirror witch
> +> such a configuration?
>
> I'll be very odd if controller's BIOS overwrite disk data.
Actually, I had the same type of thing happen to me. I put a LSI
MegaRAID IDE 100 that was lying around into my system and attached my
existing geom_mirrored drives to it. I didn't want to use the drives as
an ATA RAID, and never set them up as that in the RAID BIOS. I simply
wanted to upgrade from my onboard ATA 33 to the ATA 100 speed the card
supported, to get faster disk I/O.
To my surprise and regret, my system wouldn't boot properly (couldn't
locate the root filesystem) because the ATA RAID card had spammed its
metadata over the geom_mirror metadata, and my drives were no longer
detected as a geom_mirror.
Luckily, I was able to boot from a FreeSBIE CD and re-label my
geom_mirror with gmirror, thus saving my system. It was a bit
disconcerting, though. :-)
Cheers,
Paul.
--
e-mail: paul@gromit.dlib.vt.edu
"Without music to decorate it, time is just a bunch of boring production
deadlines or dates by which bills must be paid."
--- Frank Vincent Zappa
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?1110408229.690.8.camel>