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Windows Server 2008 R2 Thread, Hyper + V and dynamic memory on failover cluster in Technical; Hi All, Seem to be having a odd issue with my cluster. I have all my VMS on a cluster ...
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    Rozzer's Avatar
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    Hyper + V and dynamic memory on failover cluster

    Hi All,

    Seem to be having a odd issue with my cluster. I have all my VMS on a cluster shared volume which is always owned by one of my cluster host servers. The server which hosts the cluster shared volume hosts the VMs perfectly with no memory errors. But the other server which connects through to the cluster shared volume all the VMS end up with warnings on dynamic memory. Should I have two separate cluster shared volumes for each server ?

    Any ideas ?

    Thanks,

    Ross

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    ChrisH's Avatar
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    The point in CSVs is so it can be exposed to 2 or more servers at once. What you are talking about is more like using a traditional lun, with that if you have more than one vm on that lun they will all fail over together.

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    Rozzer's Avatar
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    So your suggesting having a partition/lun for each VM?

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    ChrisH's Avatar
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    No that's the old way of doing it your set up currently should be okay. I was talking about your proposed solutions being the old way of doing it.

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    Rozzer's Avatar
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    Ahh ok any possible suggestions or ideas to my situation?

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    jamesfed's Avatar
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    Dynamic Memory is relating to RAM usage - when your VMs are being hosted on the 2nd server does it run low on RAM?

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    Rozzer's Avatar
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    Nope the memory only becomes an issue on the server which is not hosting the cluster shared volume. Plenty of memory available! I have dual link MPIO to my san.

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    Are you running SCVMM with any host resurves set on the 2nd server?

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    Rozzer's Avatar
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    I am running scvmm not sure what reserve sets are...

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    You will want to go to the hosts tab then select the host you are having problems with - just click into its properties and see what its all set to as reserves.

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    Rozzer's Avatar
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    I'll give that a shot and get back to you ta for the advice

    Ross

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    Its down as Over-committed. That doesn't sound good!

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    Is there a differance in RAM between the two servers at all?

    Also this is where you should look to check the resurve settings - would be surprised if it is set at anything else.
    Capturevmm.PNG

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    Rozzer's Avatar
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    Yes one server has 24GB and other has 32GB but both servers are barely going near the 50% mark as I have evenly shared out the VMs across both.

    I have mimicked your settings as I noticed it was asking for a lot of hard drive space free.

    This was what mine was set too.

    scvmm.jpg

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    Rozzer's Avatar
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    Also here is whats happening.

    vm issue.jpg

    The VM host on the left has the cluster shared volume allocated to it where the right server doesn't. If i transfer the cluster shared volume to the right server the issue will then start on the left server.
    Last edited by Rozzer; 12th April 2012 at 10:23 AM.

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