Can I upgrade to 2014 ?

Hi, I have the following mixed infrastructure and I'd like to know if I can upgrade be 2012 (vray) to the 2014.

Cluster vmware 3.5 with his vmfs on a san

cluster vmware 5 with his vmfs on an other san/lun

Mixed VirtualMachine (about 23 servers) windows 2003 / 2003r2 / 2008 / 2008r2 / 2012 , various sqlserver, exchange 2007, Linux centos

Thank you.