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Re: [linux-lvm] Altering a Physical Volume's UUID on SATA

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.

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.


Message: 6
Date: Sun, 19 Aug 2007 19:51:49 -0400 (EDT)
From: "Stuart D. Gathman" <stuart 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 redhat com>
Message-ID: <Pine LNX 4 44 0708191740520 2161-100000 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 bmsi com>
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