[linux-lvm] Altering a Physical Volume's UUID on SATA
A.Lizard
alizard at ecis.com
Mon Aug 20 23:40:14 UTC 2007
At 03:14 PM 8/20/07, you wrote:
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>On 20 Aug 2007 at 12:55, A.Lizard wrote:
>
>Date sent: Mon, 20 Aug 2007 12:55:59 -0700
>To: linux-lvm at redhat.com
>From: "A.Lizard" <alizard at ecis.com>
>Subject: Re: [linux-lvm] Altering a Physical Volume's UUID on
>SATA
>Send reply to: LVM general discussion and development <linux-
>lvm at redhat.com>
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>
> > At 07:48 AM 8/20/07, you wrote:
> > While you probably describe a better solution, this was written to provide
> > a general solution to the "change uuid" problem to the community that
> > actually works on SATA and to provide a how-to reference for LVM
> filesystem
> > cloning in the context of the "how to set up a mirror drive quickly and
> > easily" section of an article in progress written for novices on how to
> > transition from an IDE to SATA drive in a Linux workstation.
> >
> > dd + changing uuid + vgrename appears to be the quickest and easiest
> > solution for LVM drive cloning, since the user won't have to worry about
> > setting up drive partitions or creating a MBR or setting up an LVM
> > filesystem manually.
> >
>
>I must be missing something hear. I currently handle the g4l (ghost for
>linux) project,
NOW I find out about this? Thanks for letting me know, I'll look into the
project.
> which does disk and partitioning images using dd with ftp and
>compression or can also do images to local drives or can clone disks.
I used dd between a pair of identical HDs.
>Usually this is to the same size or larger disk, and I am aware of a
>problem if cloning from an IDE drive to an SATA drive. The system will not
>mount since the initrd doesn't include the SATA support.
Debian Etch (final) *does* support SATA, presumably including proper initrd
setup. Installers before Etch beta-4 don't.
http://www.linuxhowtos.org/System/raid.htm
Thanks for writing this post, that is something I should have made clear in
my article-in-progress and ... now have.
I did the initial drive setup by doing a minimal install of Debian Etch to
the new disk to create partitions and the MBR and then opening a Live CD
and rsyncing (in overwrite mode) hda1 > sda1 and hda5 > sda5, then changing
the /boot/grub/device.map entry as follows:
(hd0) /dev/hda
from /dev/hda to /dev/sda
As soon as I did this, and changed /dev/hda5 to /dev/sda5 in /etc/fstab,
the system booted and operated normally. I am using that system to run the
e-mail client in which I am writing this post right now. (Windows is
running via a VMware Server guest)
For regular backup, I simply rsync from a modified Knoppix LiveCD with
rsync and dar scripts that automatically mount the drive partitions and
send the changes to a backup drive.
>In my case, I upgraded a system from a failing IDE drive to a new much
>larger SATA drive. It did not work at first because of tha problem. After
>finding the problem, I was able to go back to the original drive, and I
>used a process I would have to look for to create
>and initrd with the support. Then just placed it in the boot directory,
>and the
>system worked fine.
>
>I use the g4l to image my lab system that include 98, XP and Fedora with
>LVM partitions. We did use Norton Ghost in the past, but it failed with LVM
>partitions. (Actually, it would backup the LVM, but something in the boot
>partition would cause it to crash, and could get no support from Norton).
>Then I found g4u, and later g4l.
>
>
>
>
> > There are several solutions to drive cloning for experienced users and
> > admins, but for the newbie, quick, easy, and as few steps as possible are
> > in order.
> >
> > A.Lizard
> >
> > >Message: 6
> > >Date: Sun, 19 Aug 2007 19:51:49 -0400 (EDT)
> > >From: "Stuart D. Gathman" <stuart at bmsi.com>
> > >Subject: Re: [linux-lvm] Altering a Physical Volume's UUID on SATA
> > > hard drives [solved]
> > >To: LVM general discussion and development <linux-lvm at redhat.com>
> > >Message-ID: <Pine.LNX.4.44.0708191740520.2161-100000 at bmsred.bmsi.com>
> > >Content-Type: TEXT/PLAIN; charset=US-ASCII
> > >
> > >On Sat, 18 Aug 2007, A.Lizard wrote:
> > >
> > > > I bit-copied a backup LVM disk using dd from a Knoppix LiveCD (based on
> > > > Debian) and wound up with duplicate volume and uuids, meaning I
> couldn't
> > > > mount both the main and backup volumes simultaneously at the same
> time for
> > > > subsequent backups. Of course, vgrename is ineffective to allow
> > > > simultaneous mounting without changing the uuids.
> > >
> > >I would suggest copying (bitwise if desired) each LV individually to
> another
> > >volume group with a different name (and UUID). This gives you a lot more
> > >flexibility with physical storage for primary vs backup volume groups.
> > >Furthermore, your LV backup procedure can take snapshots of each LV first.
> > >
> > >--
> > > Stuart D. Gathman <stuart at bmsi.com>
> > > Business Management Systems Inc. Phone: 703 591-0911 Fax: 703
> 591-6154
> > >"Confutatis maledictis, flammis acribus addictis" - background song for
> > >a Microsoft sponsored "Where do you want to go from here?" commercial.
> >
> > member The Internet Society (ISOC), The HTML Writers Guild.
> > "You can't have in a democracy various groups with arms - you have to have
> > the state with a monopoly on power." Condoleeza Rice, US Secretary of State
> > Personal Website http://www.ecis.com/~alizard
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>
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member The Internet Society (ISOC), The HTML Writers Guild.
"You can't have in a democracy various groups with arms - you have to have
the state with a monopoly on power." Condoleeza Rice, US Secretary of State
Personal Website http://www.ecis.com/~alizard
business Website http://www.reptilelabs.com
backup address (if ALL else fails) alizard at gmail.com
PGP 8.0 key available by request or keyserver. Download PGP from:
http://www.pgpi.org for e-mail privacy.
Disaster prep info: http://www.ecis.com/~alizard/y2k.html
***Looking for INTELLIGENT new technology public policy
alternatives?*** http://www.ecis.com/~alizard/technology.html
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