Re: [Xen-users] Need advice regarding distro, Remus HA requirements

[Pasi Kärkkäinen <pasik@xxxxxx>]

On Tue, Dec 01, 2009 at 05:25:55PM +0200, Pasi Kärkkäinen wrote:
> On Tue, Dec 01, 2009 at 09:55:01AM -0500, Tait Clarridge wrote:
> > On Tue, 2009-12-01 at 20:17 +0700, Fajar A. Nugraha wrote:
> > > On Tue, Dec 1, 2009 at 8:08 PM, Pasi Kärkkäinen <pasik@xxxxxx> wrote:
> > > 
> > > > No idea if remus will make it to RHEL5 though.. probably not.
> > > 
> > > does Remus change anything in dom0/domU kernel?
> > 
> > Yes. It has some kernel patches for the suspend event channel, I believe
> > it is required for both dom0 and domU as I never got pygrub working
> > properly while testing with remus. I am also doubtful it will make it to
> > RHEL5 as even though Xen may have the patches, the code for RHEL xen
> > kernels is missing quite a few things that the linux-2.6.18 code from
> > xen.org has at this point.
> > 
> 
> This email (from Remus developer) sums it up:
> http://lists.xensource.com/archives/html/xen-devel/2009-11/msg00727.html
> 
> short answer: http://xenbits.xen.org/linux-2.6.18-xen.hg dom0 kernel is
> required (atm) for Remus.
> 
> kernel requirements for Remus:
> - dom0: IMQ support/patch
> - dom0: blktap2 support
> - domU: support for suspend over dedicated event channel. This is not an
>   absolute requirement, but makes Remus perform better/faster.
> 
> All of that currently exists only in linux-2.6.18-xen.hg.
> 
> pv_ops dom0 (2.6.3x) will/should catch up in the near future.
> 

Replying to myself..

It seems current pv_ops dom0 git tree already has IMQ support/patch in:
http://git.kernel.org/?p=linux/kernel/git/jeremy/xen.git;a=commit;h=9ffd27c570b50c00101c9c34e5f6a3850e206ada

So pv_ops dom0 kernel is only missing blktap2 support to support running Remus 
HA.

-- Pasi


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