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Monitoring for Server Memory Capacity Limits

 

Topic Last Modified: 2013-02-16

Some information in this topic pertains to Cumulative Updates for Lync Server 2013: February 2013.
warningWarning:
The information in this topic that refers to Capacity Planning pertains only to Lync 2010 Mobile clients and the Mobility Service (Mcx). Capacity Planning for the Unified Communications Web API (UCWA), used by the Lync 2013 Mobile clients, is provided by the Lync Server 2013, Planning Tool.

Two mobility performance counters can help you to determine your current usage and help you plan capacity for the Lync Server 2013 Mobility Service (Mcx), as well as to monitor memory usage for UCWA. For UCWA, the counter category is LS:WEB – UCWA. For the Mobility Service (Mcx), the counters are under the category LS:WEB - Mobile Communication Service. The counters to monitor are:

  • Currently Active Session Count with Active Presence Subscriptions, which is the current number of endpoints registered through UCWA or the Mobility Service (Mcx) that have active presence subscriptions (number of always-connected mobile users)
  • Currently Active Session Count, which is the current number of endpoints registered through UCWA or the Mobility Service

If the difference between Currently Active Session Count with Active Presence Subscriptions and Currently Active Session Count is small over time, this means that most mobile device users have an always-connected device, such as an Android or Nokia mobile device (for Mcx only). UCWA always-connected devices include Apple and Android devices running Lync 2013 Mobile clients). If Currently Active Session Count is much higher than Currently Active Session Count with Active Presence Subscriptions, this indicates that more users are using a background endpoint device, such as an Apple iOS device or Windows Phone under Mcx. (Windows Phone is the only Lync 2013 Mobile client that will register as this).

You should set a limit on the Currently Active Session Count with Active Presence Subscriptions and Currently Active Session Count performance counters based on your expected usage, capacity planning results, and ongoing monitoring of Mobility Service and other Front End Server counters. The limits you set should enable you to evaluate server capacity and raise alerts when capacity is exceeded.

To determine the appropriate limits, you need to first determine how much memory is available on the Front End Server for the Mobility Service. Monitor the counters to determine when you need to plan for extra capacity, according to the following formula:

Total memory used by the Mcx Mobility Service (MB) = 164 + (400 + 134) / 1024 * Currently Active Session Count with Active Presence Subscriptions + 400 / 1024 * (Currently Active Session CountCurrently Active Session Count with Active Presence Subscriptions)

importantImportant:
The Microsoft Lync Server 2010 Capacity Calculator is a spreadsheet that is prepopulated with all of the formulas that enable a planner to determine what the requirements will be for the servers, including CPU, memory, and hard drive. You can download the spreadsheet and an associated document at: http://go.microsoft.com/fwlink/p/?LinkID=212657

The Front End Server needs enough available memory to support the Mobility Service in failover situations. You can monitor the current available memory on the Front End Server by using the Memory\Available Mbytes counter, or by using the equation mentioned earlier, to plan for the amount of memory that you expect the Mobility Service to use.

If the amount of memory available on the Front End Server is lower than 1,500 MB when you plan for the expected number of mobility users, you need to add more hardware to support the Mobility Service. For more details, see Monitoring Mobility for Performance in the Operations documentation.

 
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