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Learning Network Manager Thread, Hyper-v Host Memory Upgrades Advice in Technical; Hi, I need to upgrade the memory in both of my Hyper-V Hosts as I currently only have 12gb spare ...
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    Darylrese's Avatar
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    Question Hyper-v Host Memory Upgrades Advice

    Hi,

    I need to upgrade the memory in both of my Hyper-V Hosts as I currently only have 12gb spare in each and we are having problems. The failover cluster isn't working as there isn't enough memory on either host to migrate machines.

    Below are screenshots of my 2 hosts. Currently each one has 60GB memory and I want to ideally double it.


    What memory do I need and where is best to buy this from? What combination of memory should I install?

    Im thinking of either removing the 2gb modules and replacing them with 8gb's or keep the 2gb modules and just populate the empty slots with 8gb's.

    HyperV-01.JPG

    HyperV-02.JPG

    Granted I cant migrate all machines across to one host prior to the upgrade, should I just shutdown each VM and
    then the host and hope all comes back up ok?

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    CHR1S's Avatar
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    How many VM's do you host?

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    Darylrese's Avatar
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    FARR to many!

    I have been here 3 months, the system was P2V'd and then built on by several people and we now have 29 VM's! As part of my plan for this year, I plan on reducing this to a maximum of 14 VM's in total spread across 2 hosts.

    We currently have 2 exchange servers, 6 DC's and 4 file servers, a Sibalious server, 2 print servers...im slowly migrating data and moving roles to shutdown some of the old ones.
    Last edited by Darylrese; 30th January 2014 at 02:02 PM.

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    CHR1S's Avatar
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    Thats approx 2Gb per VM, I would reduce the number of VM's before spending.

    The added bonus, it will be easier to manage

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    The VM rule I follow is 1 task per VM and where load balancing is needed 2 VMs per task.

    I have 24 VMs here, running across 2 hosts with 96GB RAM per host. I am of a mind that I need some more RAM too. (Bear in mind that for me, I run RDS servers on those hosts too, and they use a fairly large amount of RAM).

    I would say you've got 4 too many DCs and 2 too many file servers at least there.

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    Darylrese's Avatar
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    Yes I would wait but we are getting low system resources errors, and VM's start shutting down on their own to reserve system memory in the hosts.

    I plan on upgrading memory first to get a working fail over cluster and to resolve the issues we have been having, then migrating data and decommissioning some DC's. They are mainly Server 2003 so going to take awhile to migrate things over and also need to make extra VM's which I cant do currently to migrate data across.

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