Room servers can be configured redundantly. A master server can’t.
STRIX servers allow load balancing over multiple room servers, and the master server continuously monitors the availability of each room server to remove an unresponsive room server. Moreover, a newly started room server is added to a cluster automatically. With these functions, you can configure room servers in redundancy.
Master server doesn’t provide any redundant configuration. However, temporary stopping of a master server doesn’t impact the applications largely. So, even without redundancy in the master server, a combination of an operation practice of restarting the master server when it stopped and an appropriate client-side retry will gain some reasonable availability.