Xen users - Jan 2010 - how to dynamically increase domU''s memory?

Hi,

How do I, if it''s possible, increase a domU''s memory without
shutting it
down?

-- 
Kind Regards
Rudi Ahlers
SoftDux

Website: http://www.SoftDux.com
Technical Blog: http://Blog.SoftDux.com
Office: 087 805 9573
Cell: 082 554 7532


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It depends on the operating system.  From dom0, you can do:
xm mem-set <Domain> <memory>

So, if a domain called "Linux" needs its memory set to 1GB:
xm mem-set Linux 1024M

Some operating systems or kernel versions do not support dynamic memory sizing -
for example, I don''t think the balloon driver for Windows is working,
yet.

-Nick
>>> On 2010/01/26 at 14:13, Rudi Ahlers <Rudi@SoftDux.com> wrote:
> Hi,
> 
> How do I, if it''s possible, increase a domU''s memory
without shutting it
> down?



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On Tue, Jan 26, 2010 at 7:03 PM, Nick Couchman <Nick.Couchman@seakr.com>
wrote:
> Some operating systems or kernel versions do not support dynamic memory
sizing -
> for example, I don''t think the balloon driver for Windows is
working, yet.
The Citrix Windows PV drivers support dynamic memory resizing. They
are released as part of XCP and I have added support for them into the
upcoming xen 4.0.0 and 3.4.3 releases.


Keith Coleman

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On Wed, Jan 27, 2010 at 2:03 AM, Nick Couchman
<Nick.Couchman@seakr.com>wrote:
> It depends on the operating system.  From dom0, you can do:
> xm mem-set <Domain> <memory>
>
> So, if a domain called "Linux" needs its memory set to 1GB:
> xm mem-set Linux 1024M
>
> Some operating systems or kernel versions do not support dynamic memory
> sizing - for example, I don''t think the balloon driver for Windows
is
> working, yet.
>
> -Nick
>
>
Nick,

I already tried "xm mem-set" before I posted this, but it
didn''t do
anything, other than altering the memory value in the domU configuration
file.

The dom0 server is on CentOS 5.4 x64, and the domU as well.

So, if I want this feature, then what should I have enabled / installed?
-- 
Kind Regards
Rudi Ahlers
SoftDux

Website: http://www.SoftDux.com
Technical Blog: http://Blog.SoftDux.com
Office: 087 805 9573
Cell: 082 554 7532


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On Wed, Jan 27, 2010 at 1:08 PM, Rudi Ahlers <Rudi@softdux.com>
wrote:
> Nick,
>
> I already tried "xm mem-set" before I posted this, but it
didn''t do
> anything, other than altering the memory value in the domU configuration
> file.
>
> The dom0 server is on CentOS 5.4 x64, and the domU as well.
> So, if I want this feature, then what should I have enabled / installed?
Is it PV domU? If yes, you can try putting a setting like this on domU config

memory = "4000"
maxmem = "8000"

in that example, domU will start with 4000M memory, but you''ll be able
to increase it later with "xm mem-set" up to 8000MB. Note that there
are some memory overhead necessary to be able to balloon-up, so you
should set a realistic value for maxmem.

-- 
Fajar

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