Re: [Xen-users] understanding memory hot-plug in a paravitual domU

[Kyle Lexmond <kyl191@xxxxxxxxxx>]

Hi,
Everything that I've read said that you can't balloon the memory
beyond the maximum you specified in the config file when you created
the domain. (eg.
http://www.centos.org/docs/5/html/Virtualization-en-US/virt-task-xm-create-manage-doms.html#id2645186)

So, no, based on the docs, the behaviour that you're seeing is
expected, and, no, you can't balloon higher than the initial memory
value.

Strange that xm mem-max isn't giving errors though.

...
> **********
> # xm mem-max server 4096
> # xm mem-set server 4096
> **********
>
>
> can i suppose then that this should work?
>
> the thing is that xen doesn't complain, but both 'xen top' and the machine
> itself don't seem to show any increase in the memory.
>
> However, it works when setting a lower value.
>
> For example, I can create 'server' with 2048 and then go down to 1024 and
> then to 2048 again, but never to a higher value. So... i guess that
> mem-hotplug works because I can go down and up, but It can never go up
> higher than the initial memory value.
>
> that's why yesterday I was asking if that's is even possible,

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