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  • 1.  VM memory ballooning

    Posted Sep 30, 2011 03:55 PM

    Hello,

    I have noticed some of our VM guests have memory ballooning, do I need to give the VM guests more memory?

    Thanks



  • 2.  RE: VM memory ballooning

    Posted Sep 30, 2011 04:14 PM

    Memory ballooning is a sign that your host is over committed.

    Sent from my iPhone



  • 3.  RE: VM memory ballooning

    Posted Sep 30, 2011 04:24 PM

    If it is balooning out the momory; means your VM is underutilized; and your host is over utilized. however please monitor the OS performance first before making any decision.



  • 4.  RE: VM memory ballooning

    Posted Sep 30, 2011 05:46 PM

    Mayank05 wrote:

    If it is balooning out the momory; means your VM is underutilized;

    Underutilized has no affect on balloon driver.. host OVER utilized is SWAP, balloon kicks in when the host is overcommited



  • 5.  RE: VM memory ballooning

    Posted Oct 01, 2011 02:52 AM

    Thank you for this but I was thinking how it is possible for the vmmemctl driver to page out a memory from the guest VM if it is fully utilized? for example if I have configured 1GB of RAM to a guest, and it is utilizing it fully, how can balooning driver page out the memory from this host.

    kind regards,



  • 6.  RE: VM memory ballooning

    Posted Sep 30, 2011 05:11 PM

    Actually ballooning kicks in in two situations. Either the host (or resource pool) has memory pressure or there's a memory limit configured for the VM.

    André