CAS memory is computed as a base memory requirement for the CAS components (2GB) plus additional memory that scales based on the expected workload. Using multi-role severs gives you better availability at the Client Access server (CAS) layer, as there are more Client Access servers available to handle requests during a failure scenario. The CPU and memory guidance provided here assumes some moderate UM utilization. Attempting to apply too much science to the process (trying to get From a sizing and performance perspective, there are a number of advantages with the new Exchange 2013 architecture. When using online mode, clients can expect some performance issues from third-party add-ins, high item counts, restricted views, the number of users accessing the mailbox, among other factors. If you are using Exchange 2007 or earlier, you can utilize the Typical user profiles range from 50-500 messages per-user/per-day, and we provide guidance for those profiles.

Hopefully that leaves you with enough information to begin to properly size your Exchange 2013 deployments. For Exchange 2013, we recommend deploying a ratio of 1 Active Directory global catalog processor core for every 8 Mailbox role processor cores handling active load, assuming 64-bit global catalog servers:If we revisit our example scenario, we can easily calculate the required number of GC cores required.Assuming that my Active Directory GCs are also deployed on the same server hardware configuration as my CAS & Mailbox role servers in the example scenario with 12 processor cores, then my GC server count would be:In order to sustain double failures, we would need to add 2 more GCs to this calculation, which would take us to 7 GC servers for the deployment.As a best practice, we recommend sizing memory on the global catalog servers such that the entire NTDS.DIT database file can be contained in RAM. In fact, we could consider adjusting the CPU selection to a cheaper option with reduced performance getting us closer to a peak average CPU in worst-case failure of 80%, reducing the cost of the overall solution.To calculate memory per server, you will need to know the per-server user count (both active and passive users) as well as determine whether you will run the Mailbox role in isolation or deploy multi-role servers (Mailbox+CAS). One place that sequential IO becomes a concern is with storage solutions that are running a large amount of sequential IO through a common channel. :)Refer to the description submitted to our company's Exchange 2013 Mailbox Size've calculated. Since we specified in our example scenario that we want to survive a double failure in the single site, we would increase our 16 CAS to 18 such that we could sustain 2 CAS failures and still handle the workload.To size memory, we will use the same formula that was used for Exchange 2010:Per-Server CAS Memory = 2GB + 2GB per physical processor coreUsing the example scenario we have been using, we can calculate the per-server CAS memory requirement as:In this example, 20.77GB would be the guidance for required CAS memory, but obviously you would need to round-up to the next highest possible (or highest performing) memory configuration for the server platform: perhaps 24GB.Active Directory sizing remains the same as it was for Exchange 2010.

Since the number of logical processors visible to a virtual machine is determined by the number of virtual CPUs allocated in the virtual machine configuration, hyperthreading will not have the same impact on memory utilization described above.

Many users in the Dogfood deployment send and receive more than 500 messages per day, and typically have multiple Outlook clients and multiple mobile devices simultaneously connected and active. Creating a performance baseline for Exchange prior to implementing third-party solutions is recommended.The following performance optimizations are recommended for your Exchange 2013 environment.Set BIOS to allow the operating system (OS) to manage power.In the OS, turn on the High Performance power plan.Turn off hyper-threading on physical Exchange servers. This means that our IOPS requirements, memory requirements, and all of the other values provided in the Exchange 2013 sizing guidance should continue to be used for Exchange 2016. A great post on architectural changes, including the impact to re-sizing an Exchange 2013 environment from earlier versions, can be found in Exchange 2013 Server Role Architecture. CAS sizing is primarily focused on CPU and memory requirements. If you need even more storage, it’s quite easy to add an additional shelf of drives to the solution.Using the large deployment example and thinking about how we might size this on the commodity server platform, we can consider a server scaling unit that has a total of 24 large form-factor drive bays containing 4TB midline SAS drives. As new computers are brought online, the balance of connections served across the target computers will take a very long time to converge.With the "least connections" method, be mindful it's possible for a Client Access server to become overloaded and unresponsive during a Client Access server outage or during patching maintenance.


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