I have about 17 physical servers I wish to provide the cpu processing power needed to virtualize. They were a mismatch of different hp generations , i took the average cpu of each one and multiplied by the sum of the processing sockets clock speed ( example 15% usage multiplied by 2 sockets at 2400 (.15 * 4800 = 720 Mhz ) ) . I then did this for all 17 servers and came up with a sum of 18206 Mhz .
The server I wish to virtualize with is a dellR920 , 2 x E7-4809 V2 1.9Ghz 6 Core Processors (Option for 2 more) . So am I good ? Do I multiply 1900 * 6 ( cores) * 2 = 22800 . I know I should leave 20% for the host processing , but is my calculations correct? . This will be with vmware 5.5