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[Xen-devel] [ANNOUNCE] Remus source released

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Subject: [Xen-devel] [ANNOUNCE] Remus source released
From: Brendan Cully <brendan@xxxxxxxxx>
Date: Tue, 31 Mar 2009 21:42:40 -0700
Cc: Andrew Warfield <andy@xxxxxxxxx>, Christopher Head <chead@xxxxxxxxx>, Yoshiaki Tamura <tamura.yoshiaki@xxxxxxxxxxxxx>
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Hi all,

I'm happy to finally release Remus into the wild:


>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

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.

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