When speaking with a customer there’s a typical set of questions that can be used to open up the conversation when learning about the existing environment(s). Use these examples and walk through what an SE should be looking for over and above the answer(s).
What would you look for?
What would you ask for when sizing VDI?
When calculating the user density per node a formula that is commonly used internally is:
((Socket x Cores) x hyperthreading) +20% +15%) -CPU CVM) x CPU Overcommit
The hyperthreading value is typically 1.3
Why +20%? – It’s the uplift in performance we’ve observed in our lab testing from IvyBridge chipset to Haswell when using LoginVSI
Why +15%? – It’s the uplift in performance we’ve observed in our lab testing from Haswell chipset to Broadwell when using LoginVSI
If the desktop virtual hardware profile requires 2 X vCPUs then reduce the user quantity by 20%, if it’s 3 – 4 vCPUs then 25%
When calculating a XenApp server density per node a formula that is commonly used internally.
((((cores per node) x hyperthreading) x Haswell) x Broadwell) – CVM vCPUs) / vCPUs for the VM = VMs per node
As above the percentage uplift for Haswell is +20%, Broadwell +15% Broadwell and hyperthreading ratio 1.3
Here’s an example assuming 36 cores total, 8 vCPUs for the CVM and 8 for the Windows guest OS VM:
((((36) x 1.3) x 1.2) x 1.15)-8/8 = 7
What would you look for?