Did you know all the steps you need follow to upgrade or update Lync Server 2013?
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Follow the image from Technet: Upgrade or Update Front End Servers in Lync Server 2013:
It is a bunch of things. Now, in Skype for Business Server 2015, the steps are more easier.
Following the Technet: Path or update Front End Servers in Skype for business Server 2015 and Office 365 Summit, see the new way to do the path or update process:
So, to patch the FE Server, is good to see the health(state) of the all replicas with Get-CsPoolFabricState -PoolFqdn <fqdn of the pool>. If something is missing, you need reset the pool registrar state to quorum loss recovery…….
Reset-CsPoolRegistrarState -ResetType QuorumLossRecovery
Remember, that all this steps are applied only when you have a minimum of 3 servers in the pool.
After it, you need move all services to other Front End in the same pool, and take the server offline:
Invoke-CsComputerFailOver -NoStop -ComputerName <server to be patched or upgraded>
Apply all the patches or upgrades that you want, and then, ran the follow cmdlet to return the server:
Invoke-CsComputerFailBack -ComputerName <server patched or upgraded>
Now, repeat the last 2 steps to all the servers in this pool.