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From: "Brian A. Seklecki" <lavalamp@spiritual-machines.org>
To: Wojciech Puchar <wojtek@wojtek.tensor.gdynia.pl>
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	<20080203233311.X7800@wojtek.tensor.gdynia.pl>
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Date: Fri, 22 Feb 2008 11:43:52 -0500
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Cc: Gunther Mayer <gunther.mayer@googlemail.com>, questions@freebsd.org
Subject: Re: automatic fsck on gmirror failure
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On Sun, 2008-02-03 at 23:39 +0100, Wojciech Puchar wrote:
> it failed while rebuilding with badly written data on the disk that was 
> used, while other rebuild.
> 
> now it can't read it.
> 
> if you are sure that it doesn't pass through fsck before second reboot, do 
> the following.
> 
> 1) turn off gmirror
> 
> 2) clear gmirror header on both providers
> 
> 3) run fsck the other drive (not ad6, but the other used on mirror).
> 

Also don't forget about:

$ grep -i fsck /etc/defaults/rc.conf 
fsck_y_enable="NO"      # Set to YES to do fsck -y if the initial preen
fails.

gmirror(8) / geom(8) should automatically remove (degrade) components
with bad I/O operations after a certain threshold, but I'm pretty sure
it doesn't.

~BAS


> 4) pray
> 
> 5) after fsck will end it successfully (it should), create gmirror with 
> the disk you checked
> 
> gmirror label <options> gmirror-name /dev/thedisk
> 
> 6) reboot and start the system. should go well.