v6.3 of the Exchange 2013 Server Role Requirements Calculator has just been released.
To download it click here and for more information see the Exchange 2013 Server Role Requirements Calculator post on the Exchange Team's blog.
Changes to this version include:
- Revised Dispart.ps1 script to create database mount points consistent with JetStress performance counters;
- Added Calculator version number to record one field three of CSV export files;
- Changes in sizing guidance.
As you might already know, Exchange 2013 SP1 introduced the MAPI/HTTP protocol, which causes an increase in requests handled by the CAS role when compared to requests generated by clients using RPC/HTTP. As each connection has a measurable amount of processing overhead, this results in an overall increase to our CPU requirements on CAS, moving from a 1:4 ratio of CAS to Mailbox processor cores, to a 3:8 ratio (a 50% increase)...
Exchange Server 2013 Server Role Requirements Calculator v6.3 has been updated to take into account this guidance change.