From owner-freebsd-geom@FreeBSD.ORG Mon Nov 29 11:46:30 2004 Return-Path: Delivered-To: freebsd-geom@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id C25E716A4CE for ; Mon, 29 Nov 2004 11:46:30 +0000 (GMT) Received: from foo.nemo-project.org (foo.nemo-project.org [194.54.103.89]) by mx1.FreeBSD.org (Postfix) with ESMTP id 33DC843D5A for ; Mon, 29 Nov 2004 11:46:30 +0000 (GMT) (envelope-from terje+geom@elde.net) Received: by foo.nemo-project.org (Postfix, from userid 1001) id 5A20DD908C; Mon, 29 Nov 2004 12:47:40 +0100 (CET) Date: Mon, 29 Nov 2004 12:47:40 +0100 From: Terje Elde To: freebsd-geom@freebsd.org Message-ID: <20041129114740.GD90910@calleigh.elde.net> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.5.4i Subject: mirror handling of broken harddrives X-BeenThere: freebsd-geom@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: GEOM-specific discussions and implementations List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 29 Nov 2004 11:46:30 -0000 Hi, So far Im really happy with geom, but there is a issue Im curious about. Given faulty hardware, resulting in: ad0: TIMEOUT - READ_DMA retrying (2 retries left) LBA=35170616 ad0: TIMEOUT - READ_DMA retrying (1 retry left) LBA=35170616 ad0: FAILURE - READ_DMA timed out How would this be handled by geom_mirror if it was a part of a two-plex volume? Would geom_mirror automatically recover by reading from the other plex? Would it mark the broken plex as down, and not use/trust it? Also, when using this drive, all disk IO (against the same disk?) freezes while it`s trying to complete these reads. Would geom_mirror be able to recover quicker from this, by satisfying the request from the other plex? Thanks for any input, Terje Elde