Numa and virtual sockets question

Posted on 2014-07-14
Last Modified: 2014-08-03
I have a quick question around numa and adding more than one sockets.

I have a host that has 2 CPUs.  I also run SQL Server 2008 r2 and it supports 4 cores per processor so I have the guest with two sockets currently.  If I want to enable numa for this host, would it matter how many sockets I assign to the guest that runs the SQL server, am I stuck with one socket?
Question by:ts11
    LVL 117

    Expert Comment

    by:Andrew Hancock (VMware vExpert / EE MVE)
    Is NUMA  not enabled on your host already?

    Do you not have currently 4 vCPU allocated x 1 Core ?

    see here

    Author Comment

    The configuration I was using is 2 X virtual sockets with 4 X vcpu to each socket.  However my host has 2 cpus, 6 cores per cpu, 24 logical.

    So if I was using sticking to numa, I would assign something like 6 virtual sockets and 1 vcpu each?
    LVL 117

    Expert Comment

    by:Andrew Hancock (VMware vExpert / EE MVE)
    That would be correct, always assign vCPUs (not cores!)

    Author Comment

    Can you just clarify that? when you say always assign vCPUs and not cores.  I have H/T on my cpus, so say I want my machine to have two cores (sockets) for licensing reasons, how can I be sure that I'm staying in the numa boundary by amount of vcpus I assign or have I already stepped outside of it?

    Is there an example you could give that would be correct with numa and my host, where I have 8 vCPU and at least 2 vSockets?

    LVL 117

    Accepted Solution

    If you have licensing issues and need to assign cores, then assign cores.

    did you read the article I posted ?

    see also here
    LVL 10

    Assisted Solution

    Please check this KB and see if it helps.

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