From owner-freebsd-questions@FreeBSD.ORG Thu May 23 12:14:54 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 8BD807CE for ; Thu, 23 May 2013 12:14:54 +0000 (UTC) (envelope-from saeedeh.motlagh@gmail.com) Received: from mail-lb0-f181.google.com (mail-lb0-f181.google.com [209.85.217.181]) by mx1.freebsd.org (Postfix) with ESMTP id 15F0CB56 for ; Thu, 23 May 2013 12:14:53 +0000 (UTC) Received: by mail-lb0-f181.google.com with SMTP id w20so3314910lbh.12 for ; Thu, 23 May 2013 05:14:46 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:in-reply-to:references:from:date:message-id:subject:to :cc:content-type; bh=avNfljPWfvkP0dKi3guyo8BkvdznKDRKhct9tVtk6WU=; b=uMKkAAcoa3KEI7eRXttHtCQelzBFTPYafHWV0yYaK3IuGtioVmb2c815WX1VoP1NL6 SIbeNS9WnILSbHesxGcqKcHn8O874z8ar+miQdIqXwn6BT+gXD0Hq5QY9VoahfxzYo9i 1Z3zsOqgWuIsSaqRL5TrSkObaKTbI6qoTZW1LEPUrSwwIet8db3cEZuq+Myiqq14hnCV I86vofU1EKOCZNLjXXzLLfemlw2f5TSI5JqGGSkFGUvLHUb8JD1RMHtQvpMnHZB7+iYE jfcz24u49hDfDMaOAkMYL9y1X3jMZzu1VsXk2dW1oYkxILUSy5FFHn4Y6AESHDEqUhsF 79cA== X-Received: by 10.112.19.9 with SMTP id a9mr6298342lbe.80.1369311286627; Thu, 23 May 2013 05:14:46 -0700 (PDT) MIME-Version: 1.0 Received: by 10.112.149.33 with HTTP; Thu, 23 May 2013 05:14:06 -0700 (PDT) In-Reply-To: References: From: saeedeh motlagh Date: Thu, 23 May 2013 16:44:06 +0430 Message-ID: Subject: Re: file corruption solution (soft-update or ZFS) To: Warren Block Content-Type: text/plain; charset=UTF-8 X-Content-Filtered-By: Mailman/MimeDel 2.1.14 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 12:14:54 -0000 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. 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. > -- *Sa.M*