From owner-freebsd-questions@FreeBSD.ORG Sat May 18 05:32:39 2013 Return-Path: Delivered-To: freebsd-questions@freebsd.org Received: from mx1.freebsd.org (mx1.FreeBSD.org [8.8.178.115]) by hub.freebsd.org (Postfix) with ESMTP id DBF57484 for ; Sat, 18 May 2013 05:32:39 +0000 (UTC) (envelope-from bsd@todoo.biz) Received: from newmail.rmm.fr (newmail.rmm.fr [213.251.152.9]) by mx1.freebsd.org (Postfix) with ESMTP id A2465172 for ; Sat, 18 May 2013 05:32:39 +0000 (UTC) Received: from newmail.rmm.fr (newmail.rmm.fr [213.251.152.9]) by newmail.rmm.fr (Postfix) with ESMTP id AA873167751 for ; Sat, 18 May 2013 07:32:38 +0200 (CEST) X-Virus-Scanned: amavisd-new 2.8.0 (20120630) at rmm.fr Received: from newmail.rmm.fr ([213.251.152.9]) by newmail.rmm.fr (newmail.rmm.fr [213.251.152.9]) (amavisd-new, port 10024) with ESMTP id awHm-6AwsyaF for ; Sat, 18 May 2013 07:32:36 +0200 (CEST) Received: from newmail.rmm.fr (newmail.rmm.fr [87.98.206.99]) (using TLSv1 with cipher AES128-SHA (128/128 bits)) (No client certificate requested) (Authenticated sender: hidden) by newmail.rmm.fr (Postfix) with ESMTPSA id 5AA94167743 for ; Sat, 18 May 2013 07:32:36 +0200 (CEST) Content-Type: text/plain; charset=windows-1252 Mime-Version: 1.0 (Mac OS X Mail 6.3 \(1503\)) Subject: Re: ZFS install on a partition From: "bsd@todoo.biz" In-Reply-To: <20130518044900.GA30652@neutralgood.org> Date: Sat, 18 May 2013 07:32:35 +0200 Content-Transfer-Encoding: quoted-printable Message-Id: <511AEFEF-7CE6-4E48-916C-81FAF8F9DEED@todoo.biz> References: <5FB78660-EDA4-40DB-8A0D-B0DE23A0FB6C@kraus-haus.org> <20130518044900.GA30652@neutralgood.org> To: Liste FreeBSD X-Mailer: Apple Mail (2.1503) X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 18 May 2013 05:32:39 -0000 Le 18 mai 2013 =E0 06:49, kpneal@pobox.com a =E9crit : > On Fri, May 17, 2013 at 08:03:30PM -0400, Paul Kraus wrote: >> On May 17, 2013, at 6:24 PM, "bsd@todoo.biz" wrote: >>> 3. Should I avoid using ZFS since my system is not well tuned and It = would be asking for trouble to use ZFS in these conditions.=20 >>=20 >> No. One of the biggest benefits of ZFS is the end to end data = integrity. >> IF there is a silent fault in the HW RAID (it happens), ZFS will = detect >> the corrupt data and note it. If you had a mirror or other redundant = device, >> ZFS would then read the data from the *other* copy and rewrite the = bad >> block (or mark that physical block bad and use another). >=20 > I believe the "copies=3D2" and "copies=3D3" option exists to enable = ZFS to > self heal despite ZFS not being in charge of RAID. If ZFS only has a = single > LUN to work with, but the copies=3D2 or more option is set, then if = ZFS > detects an error it can still correct it. >=20 > This option is a dataset option, is inheritable by child datasets, and = can > be changed at any time affecting data written after the change. To get = the > full benefit you'll therefore want to set the option before putting = data > into the relevant dataset. Ok, good to know. I planned to setup a consistent Snapshot policy and remote backup using = zfs send / receive=20 That should be enough for me=85=20 Is the overhead of this setup equal to double size used on disk ?=20 >=20 > --=20 > Kevin P. Neal = http://www.pobox.com/~kpn/ >=20 > "Nonbelievers found it difficult to defend their position in \=20 > the presense of a working computer." -- a DEC Jensen paper ________________________________________________ =AB?=BB=A5=AB?=BB=A7=AB?=BB=A5=AB?=BB=A7=AB?=BB=A5=AB?=BB=A7=AB?=BB=A5=AB?= =BB=A7=AB?=BB=A5=AB?=BB=A7=AB?=BB=A5=AB?=BB=A7 =AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF= =AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF BSD - BSD - BSD - BSD - BSD - BSD - BSD - BSD - ________________________________________________ =AB?=BB=A5=AB?=BB=A7=AB?=BB=A5=AB?=BB=A7=AB?=BB=A5=AB?=BB=A7=AB?=BB=A5=AB?= =BB=A7=AB?=BB=A5=AB?=BB=A7=AB?=BB=A5=AB?=BB=A7 =AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF= =AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF PGP ID --> 0x1BA3C2FD