[libvirt] Virtio Balloon Dynamic behaviour ??

Pankaj Rawat pankaj.rawat at nechclst.in
Mon Dec 12 06:36:37 UTC 2011

Hi all,

I want to be clear in details regarding Virtio balloon Driver in RHEL
6.1 KVM hypervisor


In documentations it is written that Virtio balloon driver allow the
guest to expand its memory dynamically .


Now I want to know the meaning of dynamically ...

Whether it means

1)      We can change the memory of guest using libvirt API only i.e by
using virsh setmem command at runtime  (VERIFIED)

2)      Or the guest itself can check that it is running out of memory
so it request host for some memory and when the host respond by giving
back memory it expands its memory size. Which is automation 



The 1st   option  is working fine 


Now can anyone tell me that memory expantion  can be done
dynamically(point 2) also


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