v11 upgrade without downtime for active/standby pair?

Due the introduction of ScaleN in v11 the HA configuration has completely changed from a sync peer to a sync group, for this reason the mirroring will break and you may also be required to make some modifications to the HA configuration.

 

 

Even if it is just mirroring that is broken they you need to bear in mind how the back end application will handle the re-connections, i have a client with (peak) 20K concurrent Exchange users, if connection mirroring failed upon failover then you would have 20K clients initiating a connection to the backend Exchange servers, I'm not sure that many applications/infrastructures can handle this.

 

 

 

Play safe and arrange an hours downtime and test the upgrade before attending site on a strongbox with there config on always best to be prepared for any likelihood!