From owner-freebsd-virtualization@freebsd.org Tue Dec 5 15:58:26 2017 Return-Path: Delivered-To: freebsd-virtualization@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 43416E6EB42 for ; Tue, 5 Dec 2017 15:58:26 +0000 (UTC) (envelope-from paul@redbarn.org) Received: from family.redbarn.org (family.redbarn.org [IPv6:2001:559:8000:cd::5]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id 2F2A880393 for ; Tue, 5 Dec 2017 15:58:26 +0000 (UTC) (envelope-from paul@redbarn.org) Received: from [192.168.11.48] (200.12.232.153.ap.dti.ne.jp [153.232.12.200]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (Client did not present a certificate) by family.redbarn.org (Postfix) with ESMTPSA id 8BD7E61FA2 for ; Tue, 5 Dec 2017 15:58:25 +0000 (UTC) Message-ID: <5A26C220.2000909@redbarn.org> Date: Wed, 06 Dec 2017 00:58:24 +0900 From: Paul Vixie User-Agent: Postbox 5.0.20 (Windows/20171012) MIME-Version: 1.0 To: FreeBSD virtualization Subject: Re: Storage overhead on zvols References: <423F466A-732A-4B04-956E-3CC5F5C47390@ebureau.com> <5A26B9C8.7020005@redbarn.org> <32BA4687-AB70-4370-A9BA-EF4F66BF69A6@ebureau.com> <5A26BE25.10409@redbarn.org> <44AEC596-6BBA-44FB-92A1-99A0ED239B7A@punkt.de> In-Reply-To: <44AEC596-6BBA-44FB-92A1-99A0ED239B7A@punkt.de> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-BeenThere: freebsd-virtualization@freebsd.org X-Mailman-Version: 2.1.25 Precedence: list List-Id: "Discussion of various virtualization techniques FreeBSD supports." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 05 Dec 2017 15:58:26 -0000 Patrick M. Hausen wrote: > I'm not an FS developer but from experience as an admin that > feature - nullfs mounts into a hypervisor - while greatly desired, > looks quite nontrivial to implement. i think what's called for is a vdd of some kind, similar to the virtual ethernet and virtual disk drivers. yes, it would appear in the guest at the vfs layer. i'm surprised that the qemu community doesn't already have it. this is something virtualbox gets wrong, by the way. it offers something that sounds like what i want, but then implements it as SMB. don't get be wrong -- UFS and NFS work for me, and i love bhyve as-is. -- P Vixie