From owner-freebsd-emulation@freebsd.org Wed Nov 16 18:10:34 2016 Return-Path: Delivered-To: freebsd-emulation@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 76324C4545F for ; Wed, 16 Nov 2016 18:10:34 +0000 (UTC) (envelope-from hausen@punkt.de) Received: from kagate.punkt.de (kagate.punkt.de [217.29.33.131]) (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 123F4153B for ; Wed, 16 Nov 2016 18:10:33 +0000 (UTC) (envelope-from hausen@punkt.de) Received: from hugo10.ka.punkt.de (hugo10.ka.punkt.de [217.29.44.10]) by gate2.intern.punkt.de with ESMTP id uAGIAUxb063339 for ; Wed, 16 Nov 2016 19:10:30 +0100 (CET) Received: from [217.29.46.116] ([217.29.46.116]) by hugo10.ka.punkt.de (8.14.2/8.14.2) with ESMTP id uAGIATmf010394 for ; Wed, 16 Nov 2016 19:10:30 +0100 (CET) (envelope-from hausen@punkt.de) Content-Type: text/plain; charset=utf-8 Mime-Version: 1.0 (Mac OS X Mail 9.3 \(3124\)) Subject: Re: bhyve: zvols for guest disk - yes or no? From: "Patrick M. Hausen" In-Reply-To: Date: Wed, 16 Nov 2016 19:10:28 +0100 Content-Transfer-Encoding: quoted-printable Message-Id: References: To: freebsd-emulation@freebsd.org X-Mailer: Apple Mail (2.3124) X-BeenThere: freebsd-emulation@freebsd.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Development of Emulators of other operating systems List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 16 Nov 2016 18:10:34 -0000 Hi, all, > Am 16.11.2016 um 18:17 schrieb Jan Bramkamp : >> http://jrs-s.net/2016/06/16/psa-snapshots-are-better-than-zvols >=20 > Afaik this is only a problem if you create a reservation for your = ZVOLs. By default ZFS does create ZVOLs with reservations matching their = size. Ah ... of course. As for the rest of your kind explanation - I'm well aware of that. If you over-provision, you have to take responsibility and at least monitor usage closely (Observium, Munin, ...) Thanks, Jan! > ZFS saved my bacon more than once. Twice it detected and corrected = datacorruption on dying hardware in time. With a normal FS both cases = would have turned into bitrot spreading into the backups until it's too = late. Same here. F2or that dedicated hypervisor server I just thought for a moment I could save some memory. > Without ZFS you would require a reliable hardware RAID controller (if = such a magical creature exists) instead (or build a software RAID1+0 = from gmirror and gstripe). IMO money is better invested into more RAM = keeping ZFS and the admin happy. And we always use geom_mirror with UFS ... Thanks again, will go the ZFS route, set up the system with the 16 GB RAM it has, then upgrade to 32 in a week or two. The plan is to put around 10 VMs with 2-4 G of configured memory on that system. bhyve doesn't do page deduplication like ESXi does, yet - right? Kind regards, Patrick --=20 punkt.de GmbH * Kaiserallee 13a * 76133 Karlsruhe Tel. 0721 9109 0 * Fax 0721 9109 100 info@punkt.de http://www.punkt.de Gf: J=C3=BCrgen Egeling AG Mannheim 108285