Re: FT for XCP

[Mike McClurg <mike.mcclurg-Sxgqhf6Nn4DQT0dZR+AlfA@public.gmane.org>]

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On 09/25/2011 09:11 PM, R J wrote:
> Hello List,
>
> I have a proposal and wont mind to implement my self but need a 
> helping hand to start on.
> I want to implement the aggressive FT feature in XCP. The best way I 
> could imagine is the use of feature *Live Migration*
>
> Steps
> 1. Enable the FT of a particular VM using xe commands and adding as a 
> param to that VM e.g. xe vm-param-set FT=true uuid=XYZ
> 2. If the FT = true detected by xenstore then xapi will initiate a 
> live migrate of that VM to any of available host.
> 3. A parallel "network ping"/"xapi heartbit" from/to that host could 
> be initialized for each FT VM.
> 4. Live migrate will run forever until its disabled by FT = false or 
> one of the host is down. e.g. the process will loop at 99.99% 
> migration state
> 5. If there is a packet drop of x packets the VM Migrate procedure 
> will mark the VM Migration as Complete and will switch the devices 
> forcefully.
> -- this could result in some data loss but I dont have any alternative 
> to this.
> -- The specific x packets can be set by XCP but we cant rely for 
> default XCP Errors
> 6. If there is a successful migration due to host down then we will 
> again start from step2
>
> Above steps I have assumed to my knowledge, we can discuss the 
> problems in it.
>
> Apologies if I'm being too naive.
>
> Regards,
> Rushikesh
>
This sounds like Remus (http://nss.cs.ubc.ca/remus/). Are you proposing 
to implement Remus support in xapi?

Mike

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