From owner-freebsd-fs@FreeBSD.ORG Sun May 6 15:14:43 2012 Return-Path: Delivered-To: freebsd-fs@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [69.147.83.52]) by hub.freebsd.org (Postfix) with ESMTP id 82E48106566B for ; Sun, 6 May 2012 15:14:43 +0000 (UTC) (envelope-from simon@optinet.com) Received: from cobra.acceleratedweb.net (cobra-gw.acceleratedweb.net [207.99.79.37]) by mx1.freebsd.org (Postfix) with SMTP id 2DA6E8FC08 for ; Sun, 6 May 2012 15:14:42 +0000 (UTC) Received: (qmail 20243 invoked by uid 110); 6 May 2012 15:14:41 -0000 Received: from ool-4571afe7.dyn.optonline.net (HELO desktop1) (simon@optinet.com@69.113.175.231) by cobra.acceleratedweb.net with SMTP; 6 May 2012 15:14:41 -0000 From: "Simon" To: "Bob Friesenhahn" Date: Sun, 06 May 2012 11:14:42 -0400 Priority: Normal X-Mailer: PMMail 2000 Professional (2.20.2717) For Windows 2000 (5.1.2600;3) In-Reply-To: MIME-Version: 1.0 Message-Id: <20120506151443.82E48106566B@hub.freebsd.org> Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit X-Content-Filtered-By: Mailman/MimeDel 2.1.5 Cc: "freebsd-fs@freebsd.org" Subject: Re: ZFS Kernel Panics with 32 and 64 bit versions of 8.3 and 9.0 X-BeenThere: freebsd-fs@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Filesystems List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 06 May 2012 15:14:43 -0000 So if you have a 50TB ZFS filesystem and your memory goes bad, even if ECC, your entire 50TB is gonna go bunkers? disks fail, but memory doesn't? CPUs don't fail? There are many things in a server that can fail and cause corruption, but that shouldn't take down entire zpool. I'm okay with a few missing files ending up in lost+found, but entire filesystem? That renders the entire thing useless if you ask me. -Simon On Sun, 6 May 2012 09:59:39 -0500 (CDT), Bob Friesenhahn wrote: >On Sun, 6 May 2012, Simon wrote: >> >> Are you suggesting that if a disk sector goes bad or memory corrupts few blocks >> of data, the entire zpool is gonna go bust? can the same occur with a ZRAID? >> I thought the ZFS was designed to overcome all these issues to begin with. Is >> this not the case? >ZFS is designed to work with failing disks, but not failing memory. >It is recommended to use only systems with ECC memory. >The OS itself (any OS!) is succeptible to crash/corruption due to >failing memory but without zfs's checksums, you might not be aware of >such corruptions or the crash might be more delayed. >Bob >-- >Bob Friesenhahn >bfriesen@simple.dallas.tx.us, http://www.simplesystems.org/users/bfriesen/ >GraphicsMagick Maintainer, http://www.GraphicsMagick.org/