Message-ID: <44591376.8030408@tmr.com>
Date: Wed, 03 May 2006 16:32:54 -0400
From: Bill Davidsen <davidsen@tmr.com>
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To: Kirill Korotaev <dev@sw.ru>
CC: Kir Kolyshkin <kir@openvz.org>, 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>, herbert@13thfloor.at
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> <4454BA24.4070204@tmr.com> <4455FEBE.9080304@sw.ru>
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Kirill Korotaev wrote:
> Bill,
> 
>>> So I would detailed it like this:
>>> - freeze VPS
>>
>> when the VM stops providing services it's down as far as I'm concerned
> please, note, that connections are not dropped, new connections are not 
> responded with RESET and when VM is migrated all the clients are 
> serviced as if nothing has happened. From client point of view there is 
> only a small delay in servicing, but not a real downtime (when clients 
> are rejected). Maybe due to these some of people call it zero down-time. 
> Though from technical POV this is not the best term for sure. It is 
> better to call it checkpointing/restore or live migration.

With that I can agree. The argument that it's not down it's just 
unavailable isn't convincing. I think "live migration" is a really good 
description of what takes place, thanks for the nomenclature.
-- 
    -bill davidsen (davidsen@tmr.com)
"The secret to procrastination is to put things off until the
  last possible moment - but no longer"  -me
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