I currently have Wowza running on a cloud server with 2vCPUs, 1GB RAM w/ Windows 2008. Works perfectly.
I have this server because i was running IIS Smooth Streaming before i knew Wowza, but now i have only Wowza running and plan moving to Linux, to lower costs.
So my doubt is the hardware needed to run Wowza in Linux. It will be only the streaming server and no other applications on the server. I use RTMP for Flash, Android, BBerry and iOS devices. My current usage is 200 simultaneous clients.
The cheapest server i found here in Brazil have 1 vCPU 800MHz and 512mb of memory. Considering that Linux uses much less resources than Windows, i think it can work. Will it? Need more mem?