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Date: Tue, 11 Apr 2006 22:12:54 +0400
From: Kir Kolyshkin <kir@openvz.org>
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To: Herbert Poetzl <herbert@13thfloor.at>
CC: Kirill Korotaev <dev@sw.ru>, Bill Davidsen <davidsen@tmr.com>,
       Kir Kolyshkin <kir@openvz.org>, akpm@osdl.org,
       Nick Piggin <nickpiggin@yahoo.com.au>, sam@vilain.net,
       linux-kernel@vger.kernel.org,
       "Eric W. Biederman" <ebiederm@xmission.com>, serue@us.ibm.com,
       Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
Subject: Re: [Devel] Re: [RFC] Virtualization steps
References: <1143228339.19152.91.camel@localhost.localdomain> <200603282029.AA00927@bbb-jz5c7z9hn9y.digitalinfra.co.jp> <4429A17D.2050506@openvz.org> <443151B4.7010401@tmr.com> <443B873B.9040908@sw.ru> <20060411162055.GA22367@MAIL.13thfloor.at>
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Herbert Poetzl wrote:

>I think that zero downtime is some kind of marketing
>buzzword here, and has nothing to do with the actual
>time the migration takes, which will probably be
>around 20 seconds or so (for larger guests) ...
>  
>
IMO it is called "zero downtime" because from the user's point of view 
there is no downtime, i.e. network connections are preserved, so what 
user sees is a delay in processing, not a downtime.