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Date:      Wed, 14 Feb 2007 15:16:46 -0500
From:      John Nielsen <lists@jnielsen.net>
To:        freebsd-questions@freebsd.org
Cc:        Ivan Carey <icarey@bigpond.com>, "Brian A. Seklecki" <lavalamp@spiritual-machines.org>
Subject:   Re: How does gmirror know of a faulty drive
Message-ID:  <200702141516.46899.lists@jnielsen.net>
In-Reply-To: <20070214150908.U59589@arbitor.digitalfreaks.org>
References:  <000101c5929c$73643e30$0201a8c0@IVAN> <20070214150908.U59589@arbitor.digitalfreaks.org>

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On Wednesday 14 February 2007 15:10, Brian A. Seklecki wrote:
> On Wed, 27 Jul 2005, Ivan Carey wrote:
> > In FreeBSD 5.3 I have set up 2 drives in RAID-1 format.
> > How will I know if one of the drives is faulty such as either not working
> > or
> >
> > has some lost sectors?
> >
> > Is it possible to have gmirror email me if there is a problem?
>
> I just actually replied to a thread about this.  Apparently there is no
> automatic demotion of a device to DEGRADED.  I just had a provider error
> for a good 5 minutes of SCSI kernel messages (bad sectors, grown defects),
> without any automatic corrective action taken by gmirror(4)

In my experience gmirror will automatically detach any consumer that has a 
hard read or write error. (I haven't had occasion to use gmirror with SCSI 
devices yet though, so this could just be limited to ATA.)

Re: e-mail notification, you can get a daily report if you 
set 'daily_status_gmirror_enable="YES"' in /etc/periodic.conf. If you'd like 
more frequent checks it wouldn't be hard to put a script together to 
run "gmirror status" every N minutes from cron, parse the output and forward 
it to you if it said anything but COMPLETE for each provider.

JN



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