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Re: [Xen-users] Re : ha cluster with virtual machines as resources

To: xen-users@xxxxxxxxxxxxxxxxxxx
Subject: Re: [Xen-users] Re : ha cluster with virtual machines as resources
From: Dominik Klein <dk@xxxxxxxxxxxxxxxx>
Date: Thu, 18 Oct 2007 15:39:00 +0200
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As far as i have played with Xen , You can dynamically allocate RAM to a running VM but the OS inside the VM is NOT able to detect the increased RAM and therefore cannot utilize it. If you reboot the VM , then on reboot it will show the increased memory. ( Conditions like max mem are assumend to be satified)

If I'm not completely off here, Linux PVM domUs *do* see and utilize it.

Adding memory is not a big problem, reducing the amount of memory is one. Just imagine a process using 500 megs and you take away 200 of that while it is running. If you have 200 megs of unused memory, this should work, though.


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