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Skype for business Pool High Availability test. RRS feed

  • Question

  • Hi,

    We have Skype for Business server install with a single Pool which consist three front End servers.

    We have done all the configuration and its working fine, now need to test the high availability we are planning to bring down one of the Front End server.

    My concern is though users are distributed from the server to rest of the 2 Servers.

    I need to know how to bring up the server in to the pool. What is the command to start the skype  for business services.

    As per my knowledge minimum three server required to achieve the Quorum.

    What is the procedure to start the services in the server? Whether we need to use start-cspool command ? Will it affect other two front end servers ?

    Thanks

    Thursday, February 22, 2018 12:48 PM

All replies

  • Hi,

    in this scenario there are two important types of quorum in the Skype for Business FE Pool HA.

    1. Routing Group Level Quorum (Startup Quorum) (85% of FEs up and running)
    When you start your pool for the first time (or due to a pool quorom loss) and you have three Front End Server all of these Front End Servers needs to be online to achieve the Routing Group Level Quorum.
    In this process the routing groups (a user is member of a routing group) will be assigned to the FrontEnd Servers. Each routing group will contain 1 primary Server and 2 backup server (Primary and secondary) for their data. The primary server is responsible to synchronize the userdata to the backup servers.

    2. Pool Quorum
    After you achieve the Routing Group Level Quorum, 50% of the Front End Servers need to stay online to remain Pool Quorum. This means --> 1 FE can crash when two are still available.

    Lets say User A is in Routing Group 1 which has FE1 as primary and FE 2 and 3 as secondary backup server.
    When FE2 would crash the user would not notice because it is just a backup server. When FE1 would crash the user would sign out and the Windows farbic would promote a backup FE to the new primary Server for the routing group and the user would automatically sign in again.

    What would happen if 2 of the 3 FE go down:
    Only one FE is online so we cannot achieve Pool Quorum. The last FE Server will close the connections and stop the Front End Service automatically after 5 minutes. In this case you have to achieve the Routing Group Level Quorum again before your pool can operate normally.

    Please keep in mind that this is just a scenario with a 3 Server Front End Pool. When your pool contains more servers it is also possible to remain pool quorum even when multiple servers go down but your users can expect big issues in functionality.

    You can use start-cspool to start the skype for business services on all Front End Server.
    You can use stop-cspool to stop the skype for business services on all Front End Server.
    You can use start-cswindowsservice to start the Skype for Business services on a single Front End Server

    Hopefully this provide you some information :)

    Greets,
    Markus




    Thursday, February 22, 2018 1:37 PM
  • Hi Pal,

    Yes there is recommendation to have 3 FE servers in a pool. For proper functioning 2 of them should be live. If you are stopping the service of any one server just simply go to that server and run the below command:

    1)Stop-cspool to start the skype for business services on all Front End Server.

    2)start-cspool to start the skype for business services on all Front End Server.

    never shut down two server at the same time it will cause to loss the quorum.

    I hope it will be helpful to you.

    Thanks



    • Edited by US_James Thursday, February 22, 2018 7:24 PM
    • Proposed as answer by US_James Thursday, February 22, 2018 7:24 PM
    • Unproposed as answer by US_James Tuesday, February 27, 2018 4:07 PM
    • Proposed as answer by US_James Tuesday, February 27, 2018 4:07 PM
    Thursday, February 22, 2018 7:24 PM
  • Are there any update for this issue, if the reply is helpful to you, please try to mark it as an answer, it will help others who has similar issue.


    Best Regards,
    Leon Lu


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    Tuesday, February 27, 2018 1:08 AM