VMware vSphere

 View Only

affinity and physical host memory

  • 1.  affinity and physical host memory

    Posted Aug 13, 2019 04:55 PM

    Author : mimartin

    URL : http:////docs.vmware.com/en/VMware-vSphere/6.7/com.vmware.vsphere.resmgmt.doc/GUID-5FCC0AAA-9D58-4EDF-9A5F-8628F1C8B830.html

    Topic Name : Using CPU Affinity

    Publication Name : vSphere Resource Management

    Product/Version : VMware vSphere/6.7

    Question :

    do we need to take into consideration that the physical host memory is split into (example:Dell R710) 2 physical CPU in order to correctly configure and attribute cpu cycles.  if we have a server that has 64 gig ram per physical CPU, and we setup 2 vm's with each 48gig Ram and 4 vCPU.  i would setup the first one with affinity vCPU 0 to 3 and the second one with affinity vCPU 4 to 7... which would represent physical CPU Socket #1... leaving physical CPU Socket #2 free... but from a memory perspective... it would mean that the physical CPU Socket #1 memory would not be enough...  will esxi borrow some memory from physical CPU Socket #2 ?  when affinity is not used... it is my understanding that esxi will manage the cpu and memory attribution.. but when affinity is into play... i dont know and there is not a lot of info on this...