Question about nsx controllers

[MustafaSadek]

Hello,

i want to ask the following : 

- why in NSX-v  we were having at least 3 controllers and not 2 or 5  ?

- In NSX-T  are controllers has a least numbers too ?  

- what is the maximum numbers of Controllers and managers in NSX-T ?

Thank you

[Sreec · Accepted solution]

- why in NSX-v  we were having at least 3 controllers and not 2 or 5  ?

For. production deployment, we need 3 as we have a Leader election based on Zookeeper. In a nutshell for a three node cluster, the master must have received at least two of the votes ( from the other two nodes) 

Note: ZooKeeper can sustain only a single node failure at a time. 

- In NSX-T  are controllers has a least numbers too ?  

- what is the maximum numbers of Controllers and managers in NSX-T ?

Controllers are collapsed in NSX-T, that being said the recommended number of NSX-T Manager nodes for Production is 3 .