Re: [Devel] Re: [RFC] Virtualization steps

[Sam Vilain <sam@vilain.net>]

Bill Davidsen wrote:

>Kirill Korotaev wrote:
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>>Bill,
>>
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>>>>OpenVZ will have live zero downtime migration and suspend/resume 
>>>>some time next month.
>>>>
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>>>>
>>>Please clarify. Currently a migration involves:
>>>- stopping or suspending the instance
>>>- backing up the instance and all of its data
>>>- creating an environment for the instance on a new machine
>>>- transporting the data to a new machine
>>>- installing the instance and all data
>>>- starting the instance
>>>      
>>>
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>>>If you could just briefly cover how you do each of these steps with zero
>>>downtime...
>>>      
>>>
>>it does exactly what you wrote with some minor steps such as 
>>networking stop on source and start on destination etc.
>>
>>So I would detailed it like this:
>>- freeze VPS
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>when the VM stops providing services it's down as far as I'm concerned
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You're entirely nitpicking.

Sam.

>>- freeze networking
>>- copy VPS data to destination
>>- dump VPS
>>- copy dump to the destination
>>- restore VPS
>>- unfreeze VPS
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>and here is where my service is available again. The server may not know 
>it's been down, but the clients will.
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>>- kill original VPS on source
>>
>>Moreover, in OpenVZ live migration allows to migrate 32bit VPSs 
>>between i686 and x86-64 Linux machines.
>>    
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>I guess you're using "zero downtime" as a marketing term rather than a 
>technical term.
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