![]() ![]() A software emulator allows programs to run on a computer system other than the one for which they were originally written. With emulation, all operations are run in software by an emulator. ESXi does not use emulation to run virtual CPUs. The underlying physical resources are used whenever possible and the virtualization layer runs instructions only as needed to make virtual machines operate as if they were running directly on a physical machine.ĬPU virtualization is not the same thing as emulation. One final thought and last thing to keep in mind, ensure that the hosts in your cluster when vNUMA is being used have similar NUMA configurations to avoid issues when the VM decides to vMotion to a different host.CPU virtualization emphasizes performance and runs directly on the processor whenever possible. Be sure to test your settings on a non production server and see if the results were as expected. ![]() Incorrectly configuring NUMA can cause more problems than leaving it at the default. ![]() VNUMA is very specific to certain use cases and should be used with caution. Using the instructions above, you can change the vNUMA value or set it on VMs with less than 8 vCPUs. By default, when you create a VM with more than 8 vCPUs, vNUMA is enabled by default. This gives my 12 processor SQL Server 2 NUMA nodes with 6 CPUs each. For example, my physical hosts have a six core processor, so my NUMA node on the SQL Server is set to 6. One thing to keep in mind with NUMA is that you want to size the NUMA nodes according to the number of cores in your physical host. Add the following “” and set to the number of CPUs you want used in the NUMA node.Click the button “Configuration Parameters”. ![]() To change the NUMA setting (Keep in mind that the VM must be powered off to make this change): vNUMA is also recommended when using more than 8 vCPUs. For example, if your virtual machine has 12 CPUs and your physical host has 8 cores, you are spanning multiple CPUs. vNUMA is typically used for your “Monster VMs”, where your virtual CPUs span multiple physical CPUs. This is also a setting that can be controlled within VMware. The image above shows how NUMA breaks up the resources to create the nodes. In a nutshell, vNUMA allows you to divide your CPU and Memory resources into different nodes and allows for faster memory access. vNUMA was introduced along with vSphere 5 back in the day and is related to NUMA (Non Uniform Memory Architecture). Since I’ve been discussing this recently at work with developers and managers due to some SQL Server issues we have been having, I decided it was time to write about it. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |