From owner-freebsd-questions@FreeBSD.ORG Mon Dec 22 11:34:15 2014 Return-Path: Delivered-To: freebsd-questions@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [8.8.178.115]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by hub.freebsd.org (Postfix) with ESMTPS id 0A393882 for ; Mon, 22 Dec 2014 11:34:15 +0000 (UTC) Received: from mout.gmx.net (mout.gmx.net [212.227.17.21]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client CN "mout.gmx.net", Issuer "TeleSec ServerPass DE-1" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 915A21F03 for ; Mon, 22 Dec 2014 11:34:14 +0000 (UTC) Received: from moby.local ([109.193.238.174]) by mail.gmx.com (mrgmx103) with ESMTPSA (Nemesis) id 0MX19U-1YQF5u3yJ2-00VwtA; Mon, 22 Dec 2014 12:34:07 +0100 Message-ID: <549801AF.5000208@gmx.com> Date: Mon, 22 Dec 2014 12:34:07 +0100 From: Nikos Vassiliadis User-Agent: Mozilla/5.0 (X11; FreeBSD amd64; rv:31.0) Gecko/20100101 Thunderbird/31.3.0 MIME-Version: 1.0 To: Ashish SHUKLA Subject: Re: zvol vs plain file for VMs References: <54947594.2060202@gmx.com> <86mw6ilvyf.fsf@chateau.d.if> In-Reply-To: <86mw6ilvyf.fsf@chateau.d.if> Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: 7bit X-Provags-ID: V03:K0:On6tCwIhHt397P39JEOAs1WMMKVapx+JfXseXKlNNSDuTXDMAVT m513avPLpzrxO1wjS2LQyKXcP5Ly8D1Ck90/7HiMDDv4xJnuIQhihFkb7WhRpMRm20M2XS5 P5OWRboDlZAVHAM2cgNkA3lUN06Li/X/P1iO2jK/p4N8TaJgYtBsLDoH3soLmWaul34SiM3 /ioqHbZHncHSdR5vl37Ag== X-UI-Out-Filterresults: notjunk:1; Cc: freebsd-questions@freebsd.org X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.18-1 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 22 Dec 2014 11:34:15 -0000 On 12/20/14 06:41, Ashish SHUKLA wrote: > On Fri, 19 Dec 2014 19:59:32 +0100, Nikos Vassiliadis said: > | Hi, > > | I have to convert a mail server to a VM and I don't know what kind of > | storage to use, a plain file or a zvol? > > | Are there any pros in using ZVOLs instead of plain files? > > | Thanks, Nikos > > I don't use FreeBSD for VMs, but theoretically plain file will have filesystem > overhead which ZVOL won't. > > HTH > Hi, Thank you for your reply Ashish! When you say overhead, you mean overhead on disk or in RAM? could you explain a bit more? Thanks, Nikos