Re: [Xen-devel] [ANNOUNCE] Remus source released

[Brendan Cully <brendan@xxxxxxxxx>]

On Tuesday, 31 March 2009 at 21:42, Brendan Cully wrote:
> Hi all,
> 
> I'm happy to finally release Remus into the wild:
> 
> http://dsg.cs.ubc.ca/remus/
> 
> >From the web site:
> ---
> Remus provides transparent, comprehensive high availability to
> ordinary virtual machines running on the Xen virtual machine
> monitor. It does this by maintaining a completely up-to-date copy of a
> running VM on a backup server, which automatically activates if the
> primary server fails. Key features:
> 
>  * The backup VM is an exact copy of the primary VM. When failure
>     happens, it continues running on the backup host as if failure had
>     never occurred.
>  * The backup is completely up-to-date. Even active TCP sessions are
>     maintained without interruption.
>  * Protection is transparent. Existing guests can be protected
>     without modifying them in any way. 
> ---
> 
> The NSDI paper at http://dsg.cs.ubc.ca/remus/papers/remus-nsdi08.pdf
> contains plenty of gore about how it works, and the source has even
> more.
> 
> This is an RFC release, meant to start a discussion on how it might be
> merged with Xen and Kemari. It is not by any means in shape for
> application to the Xen tree -- right now it is optimized to be easy to
> port rather than elegant.
> 
> This is an old, but fairly stable, release against Xen 3.2, and it
> lacks HVM support. I hope to release a more up-to-date, HVM-capable
> version soon, but the port is not yet complete -- maintaining
> synchronized patches between ioemu and the rest of the tool stack has
> become quite challenging since it switched to an external git
> repository, and we're currently a bit short on manpower.

I've refreshed Remus to the tip of xen-unstable. I haven't yet
completed the HVM port, nor tested it on 64-bit dom0, but I'd
encourage anyone interested in Remus and also running 32-bit PV to try
it out. Feedback is welcome.

-b

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