Re: [Xen-users] How can we increase de maximum memory for a domU

[Jonathan Ervine <jervine@xxxxxxxxxx>]

On Friday 16 June 2006 10:44, Rachid Abdoun wrote:
> Hi,
>
> On a virtual network project, we are using xen. We haven't any
> information in xen documentation on the parameter MAXMEM. Are the ram
> of domU static or can it increase dynamicaly? Could someone explain
> how does it work? Thank you
>
You can change the amount of memory in a XEN DomU, however it seems the DomU 
does not recognise any memory assigned to it above the amount specified in 
the DomU config file. However I can reduce it dynamically and increase it 
back up to that maximum value. For example, I can specify 1024MB as the 
initial amount, then reduce the amount of memory to 64MB, then increase back 
768MB, however I cannot go to 1536MB as that is greater than my starting 
1024MB.

The command for adjusting domain memory is xm mem-set <domID> <mem>

Particularly for hardware assisted fully virtualised operating systems 
stability seems to improve by reducing Dom0 memory as much as possible.

Hope this helps,
Jon

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