Windows Server 2008 running on VMware ESXi 5.5 with uneven nubers of cores RRS feed

  • Question

  • Hi!

    We had a problem with a customer server.
    The os is Windows Server 2008 running on VMware ESXi 5.5.

    The customer wanted from the beginning 8 cores so we installed 2 vCPU with 4 cores each.

    After a while the customer wanted to update to 12 cores so we changed the configuration on the server to 4 vCPU with 3 cores each. When we did this the server only used three of the 12 cores and the rest was more or less ideling.

    After changing back to the original configuration the vCPU utilization returned to normal.

    Is this a known limitation in Windows Server 2008?
    Is this a limitation in later Server OS?


    Monday, December 19, 2016 2:31 PM

All replies

  • More cpus doesn't automatically mean more performance.  Does the VM need more vCPUs assigned to it?  If not, you'll likely see performance hits, especially if the CPUs are overprovisioned.

    Anyway, you should repost either in VMware community or a related Windows 2008 server group. Be sure to include important details like the host config (cores, RAM, disks, etc) as well as the reason for adding more cores.

    This forum is for the product Virtual Server 2005.

    Monday, December 19, 2016 5:26 PM