From owner-freebsd-hardware@FreeBSD.ORG  Wed Feb  4 08:07:54 2009
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In-reply-to: Your message of "Tue, 03 Feb 2009 17:51:42 +0300."
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Date: Tue, 03 Feb 2009 23:17:11 +0000
From: Dieter <freebsd@sopwith.solgatos.com>
Subject: Re: JMB363 and hotplugging? 
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> > SATA is supposed to support hotplugging, but I tried it with
> > the nforce4-ultra and the kernel (FreeBSD 7.0 amd64) hung. :-(
> 
> Of course you connected disks through a SATA backplane,
> which performs all the management..

Management?  What management?

umount
swapoff (and allow time for i/o)
atacontrol detach
pull sata data cable
observe hung kernel :-(
press reset button :-(