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Date: Mon, 29 Oct 2012 16:27:40 +0200
From: Andriy Gapon <avg@FreeBSD.org>
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To: Alexander Motin <mav@FreeBSD.org>
Subject: Re: svn commit: r242314 - head/sys/geom/raid
References: <201210291418.q9TEIsrZ078107@svn.freebsd.org>
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on 29/10/2012 16:18 Alexander Motin said the following:
> Author: mav
> Date: Mon Oct 29 14:18:54 2012
> New Revision: 242314
> URL: http://svn.freebsd.org/changeset/base/242314
> 
> Log:
>   Make GEOM RAID more aggressive in marking volumes as clean on shutdown
>   and move that action from shutdown_pre_sync to shutdown_post_sync stage
>   to avoid extra flapping.
>   
>   ZFS tends to not close devices on shutdown, that doesn't allow GEOM RAID
>   to shutdown gracefully.  To handle that, mark volume as clean just when
>   shutdown time comes and there are no active writes.

Perhaps something like what zfs_modevent(MOD_UNLOAD) does should also be done in
one of the shutdown hooks?
Maybe at the start of shutdown_post_sync (so that it is run before the hooks of
lower level drivers like graid)?

-- 
Andriy Gapon