From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mx1.redhat.com (ext-mx16.extmail.prod.ext.phx2.redhat.com [10.5.110.21]) by int-mx02.intmail.prod.int.phx2.redhat.com (8.13.8/8.13.8) with ESMTP id r68G1V6s005930 for ; Mon, 8 Jul 2013 12:01:31 -0400 Received: from mailserver (75-145-250-211-Connecticut.hfc.comcastbusiness.net [75.145.250.211]) by mx1.redhat.com (8.14.4/8.14.4) with ESMTP id r68G1TBt006048 for ; Mon, 8 Jul 2013 12:01:30 -0400 Received: from localhost (localhost [127.0.0.1]) by mailserver (Postfix) with ESMTP id E44643F349 for ; Mon, 8 Jul 2013 12:05:49 -0400 (EDT) Received: from mailserver ([127.0.0.1]) by localhost (mail.mohawksoft.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id HxSWDC3BJvCS for ; Mon, 8 Jul 2013 12:05:48 -0400 (EDT) Received: from mail.mohawksoft.com (localhost [127.0.0.1]) by mailserver (Postfix) with ESMTP id 834913B09B for ; Mon, 8 Jul 2013 12:05:48 -0400 (EDT) Message-ID: <731d217f00b6d8f6c16a75cbe167baed.squirrel@mail.mohawksoft.com> Date: Mon, 8 Jul 2013 12:05:48 -0400 From: markw@mohawksoft.com MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Subject: [linux-lvm] Snapshots of snapshots are not supported yet Reply-To: LVM general discussion and development List-Id: LVM general discussion and development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , List-Id: Content-Type: text/plain; charset="us-ascii" To: linux-lvm@redhat.com I'm trying to get a snapshot of a snapshot. I know the new thin provisioning stuff supports this, but I'm not sure the release state is something I can use at a customer. Using LVM2, the snapshot format is tried and true, but inefficient if you want to take multiple snapshots. Looking at dmsetup, there doesn't seem like there would be an issue taking a snapshot of a snapshot, but it is disabled in the tools. I guess my question is this: Can it be done? Is there any reason why it should not work?