[one-users] Incorrect VM monitoring

[Ruben S. Montero]

Hi

In general you can take and tune the probes at var/remotes/im/kvm.d:

1.- CPU is gathered by kvm.rb using top. (free_cpu is associated to
the idle parameter while used is total - free)

2.- In the same way, memory is obtained from virsh nodeinfo. If you
plan to use ballooning, you need to adapt the probe. Currently it is
getting the "Memory size" information

Cheers

Ruben



On Thu, May 10, 2012 at 5:05 PM, Antonio Carlos Salzvedel Furtado
Junior <acsfj08 at inf.ufpr.br> wrote:
> I noticed it too when using KVM. In my case the CPU parameter was incorrect.
> Let's say the Memory parameter was "correct", although it only prints the
> maximum amount of memory that can be allocated to a VM. It does not consider
> any information about the Virtio baloon driver, so I think this monitoring
> is kind of pointless. If I go to the Qemu Monitor and inflate the baloon,
> OpenNebula will still say that I have the same amount of memory.
>
>
> In order to test the CPU parameter, I stressed the VM. As KVM treats the VMs
> as normal processes, I just compared the OpenNebula results with the top
> command. While top output the expected result, OpenNebula seemed to print
> arbitrary numbers.
>
> Cordially,
>
> Antonio Carlos Furtado
>
>
> On Thu, May 10, 2012 at 11:35 AM, Javier Alvarez <javier.alvarez at bsc.es>
> wrote:
>>
>> Hello,
>>
>> I'm running OpenNebula over Xen in a single machine and everything works
>> fine, the VMs boot correctly and I can access them through SSH without
>> problems. The only thing is that the monitoring doesn't seem to be working
>> well because 'onevm list' doesn't show any CPU nor Memory in the VMs. Only
>> after a while, in the Memory column it appears 1020.3M, which anyways is not
>> the real value. Also, /proc/meminfo and /proc/cpuinfo in the VMs show the
>> expected values, as well as running 'xm list' in Dom0.
>>
>> Is not a big issue, but I'm afraid it could cause other problems in the
>> future.
>>
>> Thank you,
>>
>> Javi
>>
>> --
>> Javier Álvarez Cid-Fuentes
>> Grid Computing and Clusters Group
>> Barcelona Supercomputing Center (BSC-CNS)
>> Tel. (+34) 93 413 72 46
>>
>>
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-- 
Ruben S. Montero, PhD
Project co-Lead and Chief Architect
OpenNebula - The Open Source Solution for Data Center Virtualization
www.OpenNebula.org | rsmontero at opennebula.org | @OpenNebula