I'm working on scalling a AV + DD system for a project with VM's
besides of DD stereamit max number of simultanious VM backup came to light.
using the proxy deployment manager is not an option because the environment is not yet there
I unearthed this discussion : Number of Proxies
In Avamar 7.5.1 is the limit is still 48 appliances ( so 384 simultanious streams ) or as it been scalled down since the move to 8 stream / proxy.