I have a VM running Server 2003 and SQL Server 2008 on VMware ESXi. Can I safely assume this configuration can cope with a change to the number of vCPUs? Are there better solutions to address the demands of the guest? More info below...
After an upgrade to software utilising SQL, I'm seeing a notable increase of CPU demand from the SQL server, often up to 100% for a few minutes at a time. Users are complaining of slow response from the software. The VM has only one vCPU assigned. My proposed solution is to increase the number of vCPUs assigned to the VM.
Does anyone have any experience in increasing the amount of vCPUs with this configuration? The only thing that scares me is the warning in vSphere that a change "after the guest OS is installed may make your virtual machine unstable". Reading responses to similar questions, it seems it should work without incident.
Would it be best to also reserve some CPU for this VM or make a change to the processing priority via the resources "shares" property?