[one-users] Host information

[Rangababu Chakravarthula]

Thanks Tino for the information. What we have observed is when we have 
only one host and we submit a VM allocation request with memory value 
more than the value given under free but less than  value given under 
free with buffers/cache,  opennebula  is failing to provision the VM.
1) Is it expected behavior?

Also in the VM information that is displayed in onevm list and onevm show:
2) The memory value that is displayed there, is it allocated memory or 
used memory?

There was an email  last week regarding opennebula displaying 0 value 
for CPU for which your team clarified that the reason for that is 
libvirt is not reporting CPU value for KVM hypervisor.
3) How do we get CPU usage and memory usage of VM?
4) Is it possible only if we have snmp inside the VM and use some NMS 
tool to gather that?
5) Since VM is a process in the underlying hypervisor, if we get cpu and 
memory usage of the vm process, is it a true representation of VM and 
CPU usage of VM?

Thanks

Ranga

Tino Vazquez wrote:
> Hi Ranga,
>
> The free memory is calculated with the following line:
>
> $ free -k|grep "buffers\/cache"|awk '{print $4}'
>
> As you can see, this will get the 854328 figure out of the free output
> provided, similar to the 853588 shown in the output.
>
> This value is the free memory counting the cached pages that can be flushed.
>
> Regards,
>
> -Tino
>
> --
> Constantino Vázquez, Grid Technology Engineer/Researcher:
> http://www.dsa-research.org/tinova
> DSA Research Group: http://dsa-research.org
> Globus GridWay Metascheduler: http://www.GridWay.org
> OpenNebula Virtual Infrastructure Engine: http://www.OpenNebula.org
>
>
>
> On Mon, Jan 11, 2010 at 11:14 PM, Rangababu Chakravarthula
> <rbabu at hexagrid.com> wrote:
>   
>> Hello
>>
>> onehost list gives me this information of a host
>> HID NAME                      RVM   TCPU   FCPU   ACPU    TMEM    FMEM STAT
>>  5 10.10.20.215                7       400       376      400      8185632
>>  853588   on
>>
>> However when I logon to the host and execute free command, I see the
>> following result.
>>
>>                total               used           free     shared    buffers
>>     cached
>> Mem:       8185632    7900788     284844          0       6688     562796
>> -/+ buffers/cache:    7331304     854328
>> Swap:            0          0          0
>>
>>
>> The free memory seems to be very less than what onehost list is giving on
>> the management node.
>> Where does one get the value that it is displaying? Is it something it is
>> not updating frequently?
>>
>> Ranga
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>>
>>