JoJoGabor
Expert
Expert

VIrtualising Terminal Services boxes in my opinion is the hardest type of virtualisation to do successfully. It appears to be to be a black-art, you can look at performance metrics such as RAM and CPU used and it all looks OK, yet user performance is dire.

The number of vCPU per pCPU is wholly dependant on the workload of the servers. WHen it comes to virtual TS boxes, performance is often degraded very severely, and their are whitepapers on the VMware website about doing this (specifically with CItrix) which make these guidelines. It is something to do with context switching and an outer-ring in the processor (this goes over my head), but you can't expect to get consolidation ratios as high as other low-utilised servers.

You may be right about raw performance by having a single VMDK, but I have tested splitting out the pagefile and apps and it improved performance - I cant explain why. I got this reommendation from this blog...

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