Re: [Xen-users] Running State Ram Upgrade

[Mark Williamson <mark.williamson@xxxxxxxxxxxx>]

> How and is it posible to do a ram upgrade on a xen vm while running?
> And if so how would I do something like that?

The command you want is xm mem-set

You'll also want to set the maximum memory allowed to the domain (xm
mem-max) appropriately in order to control this.

Finally, IIRC, you'd need to set up the domU so that it's expecting the
RAM upgrade; either start it with the largest amount of memory it'll
ever have or set "memmap=xx" on the extra= section of the config file.
This gets appended to the kernel commandline to tell the kernel how much
memory (at most) to expect so it can size its data structures
appropriately.

I set "memmap=4G" in my domUs so that they can always handle up to 4G of
memory if necessary.  It would be nicer to have the memory map resized
automatically; I seem to remember talk of allowing this in generic Linux
so maybe we'll be able to leverage this one day!

HTH,
Cheers,
Mark


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