From owner-freebsd-geom@FreeBSD.ORG  Wed Feb 14 22:54:15 2007
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Date: Wed, 14 Feb 2007 23:54:13 +0100
From: Miroslav Lachman <000.fbsd@quip.cz>
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To: Poul-Henning Kamp <phk@phk.freebsd.dk>
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Cc: freebsd-geom@freebsd.org
Subject: Re: The right way to remove disk drive
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Poul-Henning Kamp wrote:
> In message <20070214111259.GB60265@twoflower.idi.ntnu.no>, Ulf Lilleengen write
> s:
> 
>>On ons, feb 14, 2007 at 11:45:47am +0100, Miroslav Lachman wrote:
> 
> 
>>>used by gmirror (gmirror status shows DEGRADED and running on one drive 
>>>only), atacontrol lists the drive attached to channel ata3, so I run 
>>>command `atacontrol detach ata3`. As stated in manpage "Devices on the 
>>>channel are removed from the kernel". Everything goes fine, system is 
>>>running.... but if I pull out the drive tray, system hangs and must be 
>>>power cycled.
> 
> 
> Not all ata controller chips actually support hot-plug.

OK, I understand it may not be supported, but why it works with totaly 
failed drive (where I expect system freeze) and hangs with manual remove?
Insertion of a new drive works well in both cases.

Miroslav Lachman