From owner-freebsd-questions@FreeBSD.ORG  Wed Jun  3 20:58:19 2009
Return-Path: <owner-freebsd-questions@FreeBSD.ORG>
Delivered-To: freebsd-questions@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34])
	by hub.freebsd.org (Postfix) with ESMTP id A578A106564A
	for <freebsd-questions@freebsd.org>;
	Wed,  3 Jun 2009 20:58:19 +0000 (UTC)
	(envelope-from wojtek@wojtek.tensor.gdynia.pl)
Received: from wojtek.tensor.gdynia.pl (wojtek.tensor.gdynia.pl
	[IPv6:2001:4070:101:2::1])
	by mx1.freebsd.org (Postfix) with ESMTP id DDBEE8FC1A
	for <freebsd-questions@freebsd.org>;
	Wed,  3 Jun 2009 20:58:17 +0000 (UTC)
	(envelope-from wojtek@wojtek.tensor.gdynia.pl)
Received: from wojtek.tensor.gdynia.pl (localhost [IPv6:::1])
	by wojtek.tensor.gdynia.pl (8.14.3/8.14.3) with ESMTP id n53KwBQt027655;
	Wed, 3 Jun 2009 22:58:11 +0200 (CEST)
	(envelope-from wojtek@wojtek.tensor.gdynia.pl)
Received: from localhost (wojtek@localhost)
	by wojtek.tensor.gdynia.pl (8.14.3/8.14.3/Submit) with ESMTP id
	n53KwARW027652; Wed, 3 Jun 2009 22:58:11 +0200 (CEST)
	(envelope-from wojtek@wojtek.tensor.gdynia.pl)
Date: Wed, 3 Jun 2009 22:58:10 +0200 (CEST)
From: Wojciech Puchar <wojtek@wojtek.tensor.gdynia.pl>
To: Reid Linnemann <lreid@webmail.cs.okstate.edu>
In-Reply-To: <4A26DBAD.6000005@cs.okstate.edu>
Message-ID: <alpine.BSF.2.00.0906032256170.27604@wojtek.tensor.gdynia.pl>
References: <4A26DBAD.6000005@cs.okstate.edu>
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-questions <freebsd-questions@freebsd.org>
Subject: Re: An adage for gmirror users
X-BeenThere: freebsd-questions@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: User questions <freebsd-questions.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-questions>, 
	<mailto:freebsd-questions-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-questions>
List-Post: <mailto:freebsd-questions@freebsd.org>
List-Help: <mailto:freebsd-questions-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-questions>, 
	<mailto:freebsd-questions-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Wed, 03 Jun 2009 20:58:20 -0000

> My mirror gm0 consists of two SATA disks, ad4 and ad6. Now, I have a
> finicky controller that sporadically spits out READ_DMA and READ_DMA48

or bad cables.

> timeouts inexplicably. So at some point in time immemorial after
> installing the last kernel, ad4 suffered a number of READ_DMA48 errors
> and dropped out without being removed from the mirror's provider list .
> So when I installed my new flashy kernel with all my filesystems
> mounted, it was put into /boot/kernel on the mirror, which at that point
> consisted of only ad6. On boot, the loader grabbed the kernel from

i simply have in crontab a script running once per hour:

#!/bin/sh
/sbin/gmirror status|grep -q DEGRADED && \\
mail -s "gmirror failure" myphonenumber@mygsmoperator.pl </dev/null


anyway - what a sense of using gmirror without regularly checking of 
failures at all?