From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([208.118.235.92]:39808) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1T0dRA-0003TT-K3 for qemu-devel@nongnu.org; Sun, 12 Aug 2012 15:02:57 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1T0dR8-0003Sv-10 for qemu-devel@nongnu.org; Sun, 12 Aug 2012 15:02:56 -0400 Received: from chello084112167138.7.11.vie.surfer.at ([84.112.167.138]:33293 helo=wiesinger.com) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1T0dR7-0003IT-Ms for qemu-devel@nongnu.org; Sun, 12 Aug 2012 15:02:53 -0400 Received: from [192.168.0.8] (notebook8.intern [192.168.0.8]) by wiesinger.com (8.14.4/8.14.4) with ESMTP id q7CJ02HW015647 for ; Sun, 12 Aug 2012 21:00:02 +0200 Message-ID: <5027FD32.1010609@wiesinger.com> Date: Sun, 12 Aug 2012 21:00:02 +0200 From: Gerhard Wiesinger MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Subject: [Qemu-devel] TRIM, UNMAP and QCOW2 release of block information - Thin provisioning List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Hello, As far as I saw QEMU/KVM supports the trim command on IDE/SATA devices and the UNMAP command on SCSI devices/disks (thanks Paolo Bonzini). Will the qcow2 format (or other formats) use this information and also release the blocks for thin provisioning to save disk space on filesystems? VirtualBox also has such a feature in the new beta version: http://www.fb-developers.info/blog/2012/virtualbox-v4-2-is-coming/ Thnx. Ciao, Gerhard -- http://www.wiesinger.com/