From owner-freebsd-stable@FreeBSD.ORG Fri Apr 1 17:38:46 2011 Return-Path: Delivered-To: freebsd-stable@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id C9C8C106564A for ; Fri, 1 Apr 2011 17:38:46 +0000 (UTC) (envelope-from amvandemore@gmail.com) Received: from mail-fx0-f54.google.com (mail-fx0-f54.google.com [209.85.161.54]) by mx1.freebsd.org (Postfix) with ESMTP id 58E3E8FC18 for ; Fri, 1 Apr 2011 17:38:45 +0000 (UTC) Received: by fxm11 with SMTP id 11so3605138fxm.13 for ; Fri, 01 Apr 2011 10:38:45 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:mime-version:in-reply-to:references:date :message-id:subject:from:to:cc:content-type; bh=IOybeeWZ2sn3rWxGtVpWeom/LqXuUjHEwZDbbBTO6W8=; b=sKh5KUgzO3Xgz9qa7+LRZyo6FqHcKjUS2Sk8Moe65xYmxQGAta725KNW3JfHmNI/Qa 3J1XMU+5Kk4jzvUAZYLM7ZlAl03i27Ikp6cJStfBzW7ssoTE8RL0BKz+p3VsUkgpqYwz UqGEZlYRoUV87obIsOv8phWwy1AhWSgSF+fqg= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :cc:content-type; b=hstiHsZfyNSiK01mZLvHDtf0tHCBygT+uNKenDwA1E6w82CNBKxxvugq1FTjk02KUt 5v+a/L29d+Mxe4svY/Clgx1vzIYtzA3Q7GC8DcBa17wX2Na0EjJ36j3N39Cs75+ex7PE t73tWl4YCZZ6QiFFRMpX/n3kXOWqbrVD/m9QQ= MIME-Version: 1.0 Received: by 10.223.127.210 with SMTP id h18mr3020995fas.79.1301679523470; Fri, 01 Apr 2011 10:38:43 -0700 (PDT) Received: by 10.223.101.208 with HTTP; Fri, 1 Apr 2011 10:38:43 -0700 (PDT) In-Reply-To: <7b15d37d28f8ddac9eb81e4390231c96.HRCIM@webmail.1command.com> References: <87d3l6p5xv.fsf@cosmos.claresco.hr> <874o6ip0ak.fsf@cosmos.claresco.hr> <7b15d37d28f8ddac9eb81e4390231c96.HRCIM@webmail.1command.com> Date: Fri, 1 Apr 2011 12:38:43 -0500 Message-ID: From: Adam Vande More To: Chris H Content-Type: text/plain; charset=ISO-8859-1 X-Content-Filtered-By: Mailman/MimeDel 2.1.5 Cc: mlerota@claresco.hr, freebsd-stable@freebsd.org Subject: Re: Constant rebooting after power loss X-BeenThere: freebsd-stable@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Production branch of FreeBSD source code List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 01 Apr 2011 17:38:47 -0000 On Fri, Apr 1, 2011 at 12:02 PM, Chris H wrote: > On Fri, April 1, 2011 6:29 am, Marko Lerota wrote: > > I read that ZFS don't need fsck because the files are always consistent > on > filesystem regardless > > of power loses. That the corruption can occur only if disks are damaged. > But not > > when power goes down. > > Complete nonsense. The information you read was false. > No, it's really not. ZFS's lack of recovery tools at least in the beginning were basically non existent. This is because ZFS uses a COW model with an atomic data management unit design which by it's nature addresses thing like fsck, and sudden power loss. However, things outside of a FS's control still allow corrution to happen so as UPS is just as important with ZFS as your traditional FS. Perhaps more important because the difficulty from recovering from some types of pool corruption. -- Adam Vande More