From owner-freebsd-current@FreeBSD.ORG Tue Dec 20 16:58:22 2011 Return-Path: Delivered-To: freebsd-current@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 66B531065672 for ; Tue, 20 Dec 2011 16:58:22 +0000 (UTC) (envelope-from mike@reifenberger.com) Received: from mail-out.m-online.net (mail-out.m-online.net [IPv6:2001:a60:0:32:0:1:25:1]) by mx1.freebsd.org (Postfix) with ESMTP id BAEE98FC13 for ; Tue, 20 Dec 2011 16:58:21 +0000 (UTC) Received: from frontend1.mail.m-online.net (frontend1.mail.intern.m-online.net [192.168.8.180]) by mail-out.m-online.net (Postfix) with ESMTP id 354691802680; Tue, 20 Dec 2011 17:58:20 +0100 (CET) Received: from localhost (dynscan1.mnet-online.de [192.168.8.164]) by mail.m-online.net (Postfix) with ESMTP id 8C08A1C0007C; Tue, 20 Dec 2011 17:58:20 +0100 (CET) X-Virus-Scanned: amavisd-new at mnet-online.de Received: from mail.mnet-online.de ([192.168.8.180]) by localhost (dynscan1.mail.m-online.net [192.168.8.164]) (amavisd-new, port 10024) with ESMTP id 3p+nIJX2b9ht; Tue, 20 Dec 2011 17:58:19 +0100 (CET) Received: from mail.reifenberger.com (ppp-93-104-43-176.dynamic.mnet-online.de [93.104.43.176]) (using TLSv1 with cipher ADH-AES256-SHA (256/256 bits)) (No client certificate requested) by mail.mnet-online.de (Postfix) with ESMTPS; Tue, 20 Dec 2011 17:58:19 +0100 (CET) Received: by mail.reifenberger.com (Postfix, from userid 1001) id AABCF24205; Tue, 20 Dec 2011 17:58:17 +0100 (CET) Received: from localhost (localhost [127.0.0.1]) by mail.reifenberger.com (Postfix) with ESMTP id 8365024200; Tue, 20 Dec 2011 17:58:17 +0100 (CET) Date: Tue, 20 Dec 2011 17:58:16 +0100 (CET) From: Michael Reifenberger To: Peter Maloney In-Reply-To: <4EEFA12D.2070803@brockmann-consult.de> Message-ID: References: <4EEF488E.1030904@freebsd.org> <4EEF5B5C.90905@brockmann-consult.de> <4EEFA12D.2070803@brockmann-consult.de> User-Agent: Alpine 2.00 (BSF 1167 2008-08-23) MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII; format=flowed Cc: freebsd-current@freebsd.org Subject: Re: Uneven load on drives in ZFS RAIDZ1 X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Discussions about the use of FreeBSD-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 20 Dec 2011 16:58:22 -0000 On Mon, 19 Dec 2011, Peter Maloney wrote: ... > Thanks for the info. But I am confused by it, because when my disks > moved around randomly on reboot, it really did mess things up. The first > few times it happened, there was no issue, but when a spare took the > place of a pool disk, it messed things up. I can see the UUIDs when I > look at zdb output, so I really have no idea why it messed things up. > ... but it did, so I will always caution people anyway. I can't point > you to any relevant lines of code that cause the problem, but I know it > can happen... and it will when you least expect it. ;) > Normaly spare disks are not part of the pool so it can't replace a pools disk automatically (except the property 'autoreplace' is set to 'on'). But as allways no software is error free and your issue could be an uncaught edge case of something. Theoretically it could be an timing issue during boot too due to the async GEOM/CAM nature... Bye/2 --- Michael Reifenberger Michael@Reifenberger.com http://www.Reifenberger.com