These changes are written back to the BE database, the process commonly known as Lazy writes. This and the everything that follows is why hardware requirements for Lync 2013 FE servers spiked. Whenever a Lync Server 2013 FE pool is created, 2 things happen. Have you ever wondered which server does the user reside if we enable a user for Lync on a FE pool that contains 5 servers ? The answer is User Groups. When a user is enabled for Lync, the user is assigned to a User Group. Each user group is then replicated to two other FE servers. This means that a user group will be assigned to a primary, secondary and tertiary FE server and that the users’ data that is stored on the primary FE server is replicated to the 2 neighbouring FE servers. if there are 3 servers in a FE pool, Server 1 might contain primary user group 1 and secondary user group 2, Server 2 might contain primary user group 2 and secondary user group 3 and so on. This is the method of load balancing used within the FE servers on a Lync Server 2013 pool. How do FE servers keep user information ? Databases within the servers. The above mentioned replication of user data between FE servers is the single most reason why presence can survive BE SQL server outages. Also you do not have to manually configure any of the above processes (other than enabling a user) and what is responsible for creation of user groups and automatic replication of data between FE servers ? – Windows Fabric. I first heard about windows fabric with Server 2008 R2 and ever since it has been mentioned in one form or other with Server 2012, Azure etc though never paid any attention to it, until now. Windows fabric gets automatically installed with Lync Server 2013. #CANNOT SIGN IN TO LYNC CHECK TO MAKE SURE YOU ARE ONLINE WINDOWS# #CANNOT SIGN IN TO LYNC CHECK TO MAKE SURE YOU ARE ONLINE WINDOWS#.
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