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[Xen-devel] [RFC][PATCH] Kemari v1.0 released

To: xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx>
Subject: [Xen-devel] [RFC][PATCH] Kemari v1.0 released
From: Yoshiaki Tamura <tamura.yoshiaki@xxxxxxxxxxxxx>
Date: Tue, 25 Nov 2008 14:04:32 +0900
Cc: Brendan Cully <brendan@xxxxxxxxx>, james.harper@xxxxxxxxxxxxxxxx, Andrew Warfield <Andrew.Warfield@xxxxxxxxxx>, ospk-vm@xxxxxxxxxxxxx
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I would like to announce the first release of Kemari, an open-source
virtual machine synchronization mechanism for fault tolerance.
It offers a feasible approach to fault tolerance that does not
require the use of specific hardware or modification of applications/OS.
Kemari aims to keep VMs transparently running in times of hardware
failures. It transfers the state of the primary VM to the secondary
VM when the primary VM is about to send an event to devices such as
storage and networks. The source code and further information are
available at the following site.


Older slides and video are also available at,


In addition to Linux with PV Drivers, we tested Windows with James
Harpers's GPL PV. The video
(http://www.osrg.net/kemari/download/kemari_windows.mov) demonstrates
that Windows continued transparently when power failure occurred to the
primary server.

Kemari is now listed on Xen Product Roadmap,
and we would like to ask for your reviews and comments.
Briefly, Kemari in VMM taps event channel, pauses the guest (not
suspend), prepares for transfer, and Kemari in userland transfers
the guest. On failover, Kemari on the secondary restores the guest,
and the backend drivers in dom0 set up the backend rings from the
state of the shared rings in the guest.

Could you please review the code? Any comments are appreciated.

We're also planning to merge with Remus from UBC to propose a better
solution for Xen 3.4 together.



TAMURA, Yoshiaki

NTT Cyber Space Labs
OSS Computing Project
Kernel Group
E-mail: tamura.yoshiaki@xxxxxxxxxxxxx
TEL: +81-46-859-2771
FAX: +81-46-855-1152
Address: 1-1 Hikarinooka, Yokosuka
         Kanagawa 239-0847 JAPAN

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