From owner-freebsd-questions@FreeBSD.ORG Sat May 18 00:03:39 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 4BCE2320 for ; Sat, 18 May 2013 00:03:39 +0000 (UTC) (envelope-from paul@kraus-haus.org) Received: from mail-qe0-f48.google.com (mail-qe0-f48.google.com [209.85.128.48]) by mx1.freebsd.org (Postfix) with ESMTP id 109A661B for ; Sat, 18 May 2013 00:03:38 +0000 (UTC) Received: by mail-qe0-f48.google.com with SMTP id 9so3092722qea.35 for ; Fri, 17 May 2013 17:03:32 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=x-received:subject:mime-version:content-type:from:in-reply-to:date :cc:content-transfer-encoding:message-id:references:to:x-mailer :x-gm-message-state; bh=Xxu1v/IaLdHbvrqmWdLqZixG97wFwrOfkDOxPlbqrLk=; b=YzO6kxvs7hd87dUC0GFOzfpUL+oUHC7grvMxE2SvIAqJg8Q0aW9lTr/MrOqCXAUbHJ xLWy3onSWI7GAVyehKKCjdeIoiXcWtyg2Xj8XYO7ESJj4A0cCxucpznH070LuSC2LFVK URcIFg47FulwQhQq42DGb/FrxgW2qFrCYUIi5ZcGc1mummyaaptTZgQSp9/U+HZplNhj t+BCAbuQ0BfvenNcgi4iMT+2MCVnVKlRLZM0zig6PdByBudWTEhkmRrt0JveEit/+Xx6 e5cjETEjGJ7s4KbRFucpEjJ8FVqd1e+u8R5sLbQueoEvR3YDbU81ZHTBMWWxj3+pZFt0 CkBA== X-Received: by 10.224.182.136 with SMTP id cc8mr39135181qab.10.1368835412753; Fri, 17 May 2013 17:03:32 -0700 (PDT) Received: from [192.168.2.66] ([96.236.21.119]) by mx.google.com with ESMTPSA id j3sm16074084qav.1.2013.05.17.17.03.31 for (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Fri, 17 May 2013 17:03:32 -0700 (PDT) Subject: Re: ZFS install on a partition Mime-Version: 1.0 (Mac OS X Mail 6.3 \(1503\)) Content-Type: text/plain; charset=windows-1252 From: Paul Kraus In-Reply-To: Date: Fri, 17 May 2013 20:03:30 -0400 Content-Transfer-Encoding: quoted-printable Message-Id: <5FB78660-EDA4-40DB-8A0D-B0DE23A0FB6C@kraus-haus.org> References: To: "bsd@todoo.biz" X-Mailer: Apple Mail (2.1503) X-Gm-Message-State: ALoCoQk+Ld3j/yZJ+lO/OjSXlPt3VvQvsSyPFFTA3VF+k3Tyqv3Xn03ZI0HNimlMz58AbTwAhrMF Cc: Liste FreeBSD 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 00:03:39 -0000 On May 17, 2013, at 6:24 PM, "bsd@todoo.biz" wrote: > I know I should install a system using HBA and JBOD configuration - = but unfortunately this is not an option for this server.=20 I ran many ZFS pools on top of hardware raid units, because that is what = we had. It works fine and the NVRAM write cache of the better hardware = raid systems give you a performance boost. > What would you advise ?=20 >=20 > 1. Can I use an existing partition and setup ZFS on this partition = using a standard Zpool (no RAID).=20 Sure. Be careful when you say RAID=85 I assume you mean RAIDz = configured top level vdevs. Remember, a mirror is RAID-1 and the base = ZFS striping is considered RAID-0. So set it up as plain stripe of one = vdev :-) > 2. Should I use any other solution in order to setup this (like full = ZFS install on disk using the entire pool with ZFS).=20 If the system is configured with existing LUNS use them. > 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 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). > P.S. Stability is a must for this system - so I won't die if you = answer "3" and tell me to keep on using UFS.=20 ZFS is stable, it is NOT as tuned as UFS just due to age. UFS in all of = it's various incarnations has been tuned far more than any filesystem = has any right to be. I spent many years managing Solaris system and I = was truly amazed at how tuned the Solaris version of UFS was. I have been running a number of 9.0 and 9.1 servers in production, all = running ZFS for both OS and data, with no FS related issues. >=20 >=20 > Thanks.=20 >=20 >=20 > ________________________________________________ > =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 >=20 > _______________________________________________ > freebsd-questions@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-questions > To unsubscribe, send any mail to = "freebsd-questions-unsubscribe@freebsd.org" -- Paul Kraus Deputy Technical Director, LoneStarCon 3 Sound Coordinator, Schenectady Light Opera Company