From mboxrd@z Thu Jan 1 00:00:00 1970 References: <20160516111416.GA26132@agk-dp.fab.redhat.com> From: Zdenek Kabelac Message-ID: <5739B5E2.2010704@redhat.com> Date: Mon, 16 May 2016 13:58:26 +0200 MIME-Version: 1.0 In-Reply-To: <20160516111416.GA26132@agk-dp.fab.redhat.com> Content-Transfer-Encoding: 7bit Subject: Re: [linux-lvm] LVM Merge 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"; format="flowed" To: Tom Jay , "linux-lvm@redhat.com" On 16.5.2016 13:14, Alasdair G Kergon wrote: > On Sun, May 15, 2016 at 04:35:44AM +0000, Tom Jay wrote: >> I've posted a question to the debian-user mailing list, but am yet to receive a response. >> I am running Debian 7.9 64-bit with kernel version 3.2.0 and would like to use the 'lvconvert --merge' feature, but do not have 'snapshot-merge' support in the kernel. Does anyone have any idea how to enable this? >> The original post is here: https://lists.debian.org/debian-user/2016/05/msg00496.html. > > So you don't have any snapshot support in your running kernel. > But your kernel is modular, and if you attempt a snapshot operation, > lvm2 will try to load the snapshot module if it is available. > > To try this manually, do 'modprobe dm-snapshot' (see 'man modprobe') > then retry 'dmsetup targets'. Please always attach version of lvm2 and kernel in use. Debian version has some local patches for 'modprobe' usage - so maybe check it 'auto' modprobe works properly in your case ? (rmmod dm-snapshot - and check if lvcreate -s still works) Are you build your own kernel - or do you use 'distro' debian kernel ? Regards Zdenek