I learned something today about Lync virtualization. We recommend an 8 CPU core (Enterprise class CPU) hardware profile for a physical Lync Server. However, Hyper-V supports a maximum of 4 virtualized CPU core. Due to this resource constraint, a virtualized Lync Server role can handle approximately 50% of the load compared to a physical server running Lync Server and using the recommended hardware specifications.
In addition, a 10% virtualization overhead is deducted.To find out more check out the whitepaper here.
however these are recommended stats. In many cases you will have ocs FE server running for 1K users, so it is fully enough with 2 vCPU un 4GB of RAM.
fully agree. Those sizing numbers are for US mammoth companies with 100.000s of users. In Europe if we have 1000 users, it is considered to be a huuuge customer deployment, and great sales achivement.