From mboxrd@z Thu Jan 1 00:00:00 1970 Subject: Re: [linux-lvm] LVM Snapshots for remote archiving. From: Greg Freemyer In-Reply-To: <401807B2.6060900@gene.concordia.ca> References: <4016EE45.1050300@gene.concordia.ca> <1075246162.25365.16.camel@david.internal.NorcrossGroup.com> <4017E699.5020703@gene.concordia.ca> <1075310348.25365.43.camel@david.internal.NorcrossGroup.com> <401807B2.6060900@gene.concordia.ca> Message-Id: <1075394278.25365.93.camel@david.internal.NorcrossGroup.com> Mime-Version: 1.0 Content-Transfer-Encoding: 7bit Sender: linux-lvm-admin@sistina.com Errors-To: linux-lvm-admin@sistina.com Reply-To: linux-lvm@sistina.com List-Help: List-Post: List-Subscribe: , List-Unsubscribe: , List-Archive: Date: Thu Jan 29 11:52:02 2004 List-Id: Content-Type: text/plain; charset="us-ascii" To: linux-lvm@sistina.com On Wed, 2004-01-28 at 14:04, Chris Beck wrote: > >I don't think that is a trivial issue, and I think the code would have > >to implemented in the kernel. > > > > > Why the kernel? ... surely reading the flag tables could be done in user > space? I think you have the necessary logic spot on. I don't think the COW flag table is accessible from userspace, but I could be wrong. FYI: I am a LVM user, not a developer. > > >New code would also have to be developed to apply the above blocks. > > > > > Hmmm. I can mess around in perl and java as well as the next guy, but > my c-fu is weak, very weak. How much would it cost to sponsor someone > to do this do you think? I don't have any idea. If your serious, I would recommend doing it with LVM 2 (requires DM in the kernel), since DM is part of 2.6.x vanilla and 2.6.x will not likely ever support LVM 1.x. In that case, I would post on the dm-devel list. There seem to be a few non-Sistina people that are very knowledgable and post regularily. http://lists.sistina.com/mailman/listinfo/dm-devel FYI: Since Sistina is in the process of being bought by Redhat, I doubt they would consider a new project (or sub-project) right now. HTH Greg -- Greg Freemyer