Lync Server 2013 2FE + 2BE High Availablity Issue

new uc - niu's uc


  • Why 2 FEs?

Microsoft has clearly said that 2 FE topology is supported, but not recommended. Then why I still chose to deploy such a topology? In a word, the decision-maker made this choice. More considerations, a 3rd FE costs another Lync Server license and more resource, yet Microsoft hasn’t clearly mentioned that it could cause the following unexpected issue.

  • System Topology


Lync Server 2013
Enterprise Edition Pool, FE * 2
BE mirroring, BE01 as Principal, BE02 as Mirroring
Virtual machines on 2 physical hosts

  • HA considerations

Service can continue if any single server downs (FE or BE)
Service can continue if any single physical host downs (#1 or #2)


When testing HA, the following issue occurs:
(Single-server-failure test passed in any case, and physical-host #2-failure test passed as well)
If one FE and the Principal BE fail, even if you fail over BE to Mirroring BE…

View original post 1,270 more words

One thought on “Lync Server 2013 2FE + 2BE High Availablity Issue

  1. Sounds like MS need to have a special quorum mode for 2 nodes fabric use. Netapp do the same thing when there are is only 1 HA Pair (2 Nodes) in a cluster. You disable it when you add the 2nd HA Pair

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