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Author: Byron Spurlock

Skype for Business Server 2019 Capacity Planning for Front End Servers

Front End servers S4B server 2019 offers some new sizing numbers compared to S4B server 2015. What we are used to in S4B server 2015 is the max capacity for users in a pool being 80k consisting of 12 Front End servers. For S4B server 2019, the limit has increased to 106k users on 16 Front End servers. So that means the largest number of Front End servers we can now have in a pool is 16. So how doe...

Skype For Business Server 2015 Conferencing Limits

There have been many discussions within the Lync community regarding how many conferences Lync Server 2013 on-premise can support and \ or handle. Ironically these are two different topics in their own rights with regards to supported and what will technically work especially with the adjusted supported number of users per Lync 2013 Front-End server (which is 6660 users, if you didn’t know). In th...

Skype for Business 2015 – Confirmation of Pool Failover and Failback

One of the things during the midst of either a disaster recovery exercise or performing the real thing is confirmation if you have truly failed over and / or failed back.   Running the cmdlet Get-CsUserPoolinfo username does not really tell you, that you have failed over and or failed back. In addition, once you have run the Invoke-CsPoolFailover and Invoke-CsPoolFailback cmdlets you can dig aroun...

Skype Business Server 2015: Difference Between Active and Concurrent Users

There are two key words when working with Skype for Business server 2015 that you should be aware of and those are: Active and Concurrent. These particular words will come up quite a bit when you are working with design, capacity planning, or troubleshooting an issue. At the end of the day, regardless of the scenario you are working with, its important to understand what these words mean and how t...

Skype for Business Server 2015 Codecs

Skype for Business Server 2015 (S4BS) has numerous codecs that can be leveraged in different types of communication depending on the workload that the end users are engaged with. Everything from peer-to- peer calls to conference calls leverage various codecs ranging from G.711 to Siren.  Depending on the type of  codec that is leveraged, you can end up changing your S4BS design infrastructure and ...

How Many Skype Front-End Servers Can I Reboot in a “Routing Group” Quorum?

The routing group quorum is a  particularly interesting one because its what is used to decide if a user will see the message “Limited Functionality” message on their Skype client when a pool failover is “NOT” taking place.   We can use the example that we have 12 Front – End servers in a pool.    The fact that our user routing group could actually exist on any three of the twelve Front-End server...

How Many Front-End servers can I reboot – “Pool” Quorum?

With the presence of Windows fabric used in Skype for Business server 2015 in relation to pool quorum and the existence of routing group quorums, we have to be careful about how many Front-End servers are rebooted at the same time as to not affect the quorum on any of them. Here we’ll take a look at both Pool and Routing Group quorum and areas to take into consideration when reboots are requ...

Skype for Business 2015 – Even or Odd Number of Front End servers

Lync server 2013 started the concept of needing a minimum of three Front End (FE) servers to make a pool and routing group quorum. Over the course of versions from Lync 2013 to Skype 2015, stories have changed (apparently), not really quite sure why.  I have heard talks of needing to have an odd number of servers in a Lync 2013 or Skype environment, which is not true.     The specific need to have...