Microsoft Exchange right-sizing

The following chapter provides a recommendation for a Microsoft Exchange 2013 Server configuration. Please consider this information either by sizing your resource pools if the “Allocation pool” model is used or by selecting the vCPU performance class if the “pay as you go” model is used.

Sizing recommendation

# of users CPU (per VM) CU (per vCPU) RAM (per VM) OS Disk (per VM)
100 1 12 16 80
200 2 18 16 80
500 2 24 16 80
1000 2 24 24 80

Performance tests with less than 16GB of RAM have shown that not even all Exchange Services could be started properly.

Adding memory

Adding memory to a running Exchange virtual machine provides no additional benefit unless the virtual machine was rebooted or Exchange services were restarted.

In contrast, removing memory that JET had allocated for database consumption impacts performance of the store worker and indexing processes by increasing processing and storage I/O.

For getting further information about Exchange Server right sizing, please see:

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