Subject: Re: [linux-lvm] Running LVM on shared LUNs
From: Joshua Aune <luken@omner.org>
In-Reply-To: <200608080050.42004.peregrine@openbrainstem.net>
References: <1154987972.16651.28.camel@localhost.localdomain>
	<200608080050.42004.peregrine@openbrainstem.net>
Date: Tue, 08 Aug 2006 09:01:50 -0600
Message-Id: <1155049310.16651.42.camel@localhost.localdomain>
Mime-Version: 1.0
Content-Transfer-Encoding: 7bit
Reply-To: LVM general discussion and development <linux-lvm@redhat.com>
Content-Type: text/plain; charset="us-ascii"
To: LVM general discussion and development <linux-lvm@redhat.com>

On Tue, 2006-08-08 at 00:50 -0600, Lamont R. Peterson wrote:
> > The million dollar question is, can system1 and system2
> simultaneously
> > have both of the VGs active without hosing any data?
                                                  ^^ lvm metadata
> 
> As I understand it, only if you are using a filesystem that supports
> clustered operations, like GFS.
> 

Just to be clear, I should be able to issue [lv|vg]change -ay on both
systems simultaneously with no LVM corruption (data integrity will be
maintained by not starting a filesystems on both nodes simultaneously)
(as long as I don't start the filesystem on both nodes).

I would use something like GFS, but this is a HA setup for Lustre
oss/mds nodes :) 

Thanks again,
Josh