How to size RAM of Citrix PVS server

The formula to rightsize PVS server memory is as follows

 2GB + (No: of XA_vDisk * 4GB) + (no: of XD_vDisk * 2GB) + 15% (Buffer)

Example:

if i have 2 vdisk for xenapp machines and 4 disks for xendesktop then the calulations will be

RAM= 2GB + (2 * 4) + ( 4 * 2GB) + 15% = 2+8+8+ 3 GB(~15%) = 22 GB

Note: the Ratio can be reduced if we use PVS acclerator on Xenserver and RAM usage can be monitored by RAMMAP -

 RamMap is a great tool for more detailed investigation from Mark Russinovich. PVS is using only physical memory for caching (pagefile is not being used for standby cache) and RamMap gives you perfect details about usage of your RAM.

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