Re: [Xen-devel] Remus and Kemari...

[Gilberto Nunes <gilberto.nunes@xxxxxxxxxxxxxxx>]

Em Quarta-feira 20 Janeiro 2010, às 22:20:17, Brendan Cully escreveu:

Hi Brendan...


> On Thursday, 14 January 2010 at 09:52, gilberto nunes wrote:
> > I installed the Remus but had some problems.
> > He leaves the VM very slow. I'm using a partition with DRBD / LVM.
> > May even be that you say that has many layers (DRBD / LVM) that can
> > influence on performance.
> > But the interesting thing is that when Remus is not running the VM is
> > light even with 512M of memory. And look what I'm talking about a Windows
> > 2003 Standard Edition.
> > The Remus to stop working inexplicably (at least for me)
> > and let the VM's started in a state of the two nodes ...
> 

> It's taken me a while to get Xen unstable running again, but now that
> I have I can't reproduce any of these problems with an XP guest. It
> remains responsive while Remus is running, and doesn't fail over
> unless I kill it.

Right

> 
> Disk access isn't likely to make a huge performance difference
> (although I should say, simply parking a Remus VM on top of DRBD is
> not safe, since there is no way of rolling back changes that have been
> written since the most recent checkpoint). 

What you suggest... NFS!

> It sounds like your network
> link between the primary and backup is either low capacity or flaky in
> some way, or you have a loaded dom0.

My network between primary and backup server is a dedicate network, make with 
a dedicate fast ethernet switch...

I do not understand wath you say about that "I have a loaded dom0". On fact, 
Xen always have a loaded dom0, right!

> 
> I'd recommend using single-processor dom0 and guest to start with, and
> pinning the VCPUs to their own separate physical cores. 

I see. But how I do this!! I am a newbie. If you can point some ways to me, 
I'll appreciate...

> I'd also do a
> bit of network measurement along the link you're using to the backup,
> to check capacity, latency, and jitter.
> 


Thanks a lot
-- 

Gilberto Nunes Ferreira
TI
Selbetti Gestão de Documentos
Telefone: +55 (47) 3441-6004
Celular: +55 (47) 8861-6672 








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