From owner-freebsd-questions@FreeBSD.ORG Thu May 23 12:18:33 2013 Return-Path: Delivered-To: freebsd-questions@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by hub.freebsd.org (Postfix) with ESMTP id D49F5BCA for ; Thu, 23 May 2013 12:18:33 +0000 (UTC) (envelope-from trond@fagskolen.gjovik.no) Received: from smtp.fagskolen.gjovik.no (smtp.fagskolen.gjovik.no [IPv6:2001:700:1100:1:200:ff:fe00:b]) by mx1.freebsd.org (Postfix) with ESMTP id 619A2BFF for ; Thu, 23 May 2013 12:18:33 +0000 (UTC) Received: from mail.fig.ol.no (localhost [127.0.0.1]) by mail.fig.ol.no (8.14.7/8.14.7) with ESMTP id r4NCIUp4068022 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO); Thu, 23 May 2013 14:18:30 +0200 (CEST) (envelope-from trond@fagskolen.gjovik.no) Received: from localhost (trond@localhost) by mail.fig.ol.no (8.14.7/8.14.7/Submit) with ESMTP id r4NCIU0J068019; Thu, 23 May 2013 14:18:30 +0200 (CEST) (envelope-from trond@fagskolen.gjovik.no) X-Authentication-Warning: mail.fig.ol.no: trond owned process doing -bs Date: Thu, 23 May 2013 14:18:30 +0200 (CEST) From: =?ISO-8859-1?Q?Trond_Endrest=F8l?= Sender: Trond.Endrestol@fagskolen.gjovik.no To: saeedeh motlagh Subject: Re: file corruption solution (soft-update or ZFS) In-Reply-To: Message-ID: References: User-Agent: Alpine 2.00 (BSF 1167 2008-08-23) Organization: Fagskolen Innlandet OpenPGP: url=http://fig.ol.no/~trond/trond.key MIME-Version: 1.0 Content-Type: MULTIPART/MIXED; BOUNDARY="2055831798-1052084753-1369311510=:72982" X-Spam-Status: No, score=-2.9 required=5.0 tests=ALL_TRUSTED,AWL,BAYES_00 autolearn=ham version=3.3.2 X-Spam-Checker-Version: SpamAssassin 3.3.2 (2011-06-06) on mail.fig.ol.no Cc: freebsd-questions 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: Thu, 23 May 2013 12:18:33 -0000 This message is in MIME format. The first part should be readable text, while the remaining parts are likely unreadable without MIME-aware tools. --2055831798-1052084753-1369311510=:72982 Content-Type: TEXT/PLAIN; charset=ISO-8859-1 Content-Transfer-Encoding: 8BIT On Thu, 23 May 2013 16:44+0430, saeedeh motlagh wrote: > thanks for your reply. > > you know i have a sensitive server and unfortunately it is located some > where that power outage happens much. so i want guarantee my data and avoid > data lost and file corruption in my server. Maybe you should also invest in a decent UPS. > i do not have any problem in RAM and hardware. > > i don't know which approach is more suitable for my server. using > soft-update or ZFS. please help me to select the best one. > > thank you so much > > On Thu, May 23, 2013 at 4:28 PM, Warren Block wrote: > > > On Thu, 23 May 2013, saeedeh motlagh wrote: > > > > hello every body > >> > >> i have a question about fixing file corruption in freebsd. > >> > >> now i have freebsd8.2 and some times file corruption happened on it. this > >> issue has a heavy cost for me and i want to avoid it or fixit it > >> completely. so my question is: > >> > >> is it better to upgrade my freebsd to 9.1 and use soft update or migrate > >> from UFS to ZFS? > > > > That's a judgement call, which means "it depends". > > > >> i heard so much about soft update -that is added in freebsd9.1- which can > >> fix file corruption in acceptable way with low cost but i don't know how > >> much is reliable and efficient. > > > > Several things: > > > > Soft updates have been around for quite a while. > > Soft updates journaling is the new addition. > > Neither of these address file corruption. Their purpose is to make sure > > the filesystem does not get corrupted, but individual files could still > > contain bad data. > > > > in the other hand, i think migration from UFS to ZFS can be another > >> solution. as i read ZFS is is created to solve all the problems related > >> integrity file system. is it reliable enough in comparison soft-update? > >> > >> now, i want to know which solution is better and why? > > > > Again, it depends. Does the target system have enough RAM for ZFS? If > > the file corruption is due to a hardware problem or an application writing > > bad data, no filesystem can prevent that. -- +-------------------------------+------------------------------------+ | Vennlig hilsen, | Best regards, | | Trond Endrestøl, | Trond Endrestøl, | | IT-ansvarlig, | System administrator, | | Fagskolen Innlandet, | Gjøvik Technical College, Norway, | | tlf. mob. 952 62 567, | Cellular...: +47 952 62 567, | | sentralbord 61 14 54 00. | Switchboard: +47 61 14 54 00. | +-------------------------------+------------------------------------+ --2055831798-1052084753-1369311510=:72982--