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Em Quinta-feira 21 Janeiro 2010, às 08:43:27, Pasi Kärkkäinen escreveu:
> On Thu, Jan 21, 2010 at 08:40:35AM -0200, Gilberto Nunes wrote:
> > Em Quinta-feira 21 Janeiro 2010, às 08:16:55, você escreveu:
> >
> > Hi Pasi
> >
> > > On Thu, Jan 21, 2010 at 08:12:21AM -0200, Gilberto Nunes wrote:
> > > > 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...
> > >
> > > Not sure if Fast Ethernet is enough for Remus syncing?
> >
> > Well, I try too with crossover network cable, in Giga Ethernet, but I
> > have the same...
> >
> > > > I do not understand wath you say about that "I have a loaded dom0".
> > > > On fact, Xen always have a loaded dom0, right!
> > >
> > > I bet he meant "do you have high load on dom0", aka do you have high
> > > cpu usage in dom0? Try running "xm top" to figure out. And also normal
> > > "top" in dom0.
> >
> > Ok... I run xm top and get this:
> >
> > NAME
> > Domain-0
> >
> > STATE
> > -----r
> >
> > CPU(sec)
> > 135
> >
> >
> > CPU(%)
> > 0.6
>
> So it's not using much CPU.
right... indeed I have just one VM running right now... My server has 8G amount of memory and it is a Intel Xeon E3113 3.00 GHZ
>
> > MEM(k)
> > 7226368
> >
> > MEM(%)
> > 86.2
>
> Did you configure dom0_mem= for Xen?
Yes! It's dangerous or not!!
>
> See:
> http://wiki.xensource.com/xenwiki/XenBestPractices
>
> Or is there something in dom0 using all the memory for real?
no... all clean... :)
> Run "top" in dom0, and sort by memory usage by pressing shift+m.
>
> > MAXME(k)
> > no limit
> >
> > MAXMEM(%)
> > n/a
> >
> > VCPUS
> > 2
> >
> > Something wrong!!!
> >
> > >>> 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...
> > >
> > > See:
> > > http://wiki.xensource.com/xenwiki/XenCommonProblems
> > >
> > > There's a chapter called "How can I limit the number of vcpus my dom0
> > > has?" and "Can I dedicate a cpu core (or cores) only for dom0?"
> >
> > I see... However, this procedure do not take alway the beneficity of
> > multi- core processors to my VM's!!!!
>
> You can still use multiple cores on your VMs.
>
> If you don't want to dedicate a core only for dom0, at least configure the
> domain weights so that dom0 is guaranteed to get enough CPU time.
So, in theoretical way, Remus would running properly with this adjust right! (sorry, I using now KDE 4 on opensuse, and I cannot yet configure my keyboard proerly, so the dor question go always from my board...rsrsrsr...)
Thanks for all....
>
> -- Pasi
>
>
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>
--
Gilberto Nunes Ferreira
TI
Selbetti Gestão de Documentos
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