Re: [Xen-users] I need some answers please

[Simon Hobson <linux@xxxxxxxxxxxxxxxx>]

inas mohamed wrote:

> 1. But if this is the case what is the benefit of using a resource pool??
Not sure what the question is here. You have a real machine with X 
amount of memory. By the time you've allowed some for Xen and Dom0, 
you have Y left over. You can snow start guests that use up to Y 
memory between them. If you shut one down, you can reuse it's memory 
for another guest.
If things get unbalanced, you can move a guest to another host that 
has more free memory - and given the right setup this can be a live 
migration.
If you find you need to start another guest, then (depending on the 
systems) you may be able to squeeze enough memory by ballooning the 
other guests down a bit.
> 2. You said if VM is down it will release the RAM. why when I tried 
> to find free memory on the host (using free -m) I am not be able to 
> see more free memory? actually even the total memory is not 
> correct.So, the correct question is how to find the total and free 
> physical memory on XCP host??
Don't forget that the Dom0 kernel is also running as a (PV) virtual 
machine. It will only see the memory given to it by Xen - none of the 
normal GNU/Linux tools will show you real memory utilisation for the 
host machine.
Not sure where else to find the memory utilisation, but it is shown by xentop.


--
Simon Hobson

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