It's difficult to be precise about this, particularly with regards to traffic and server loading expectations. I would suggest requesting our
Load Testing Tool. This can be used to simulate viewer streaming sessions. Then a simple monitoring of the hardware should show potential capabilities and bottlenecks. You can also find a number of "streaming bandwidth calculators" online, if you do a search for that term. They can be useful to quickly calculate network requirements.
If you are looking at more than one Wowza server providing access to the same video sources then I'd suggest looking at our
MediaCache AddOn. This will help reduce network bandwidth to the central source files. It handles calls to the central file source, either over HTTP or filesystem requests such as NFS. It caches any parts of a file that is requested by a viewer on the Wowza "Vod Edge" server so future calls will be serviced locally. It can also then be easier to expand for future growth by simply adding more Wowza Edge servers.