As outlined in Supported Number of DVMs, to deploy more than 250 DVMs you must use a VDM collection type.
The Pano Virtual Desktop Solution can support as many as 2000 Pano devices, using Pano Virtual Desktop Solution scalability feature. This feature enables you to configure a group of Pano Managers (up to eight) to serve as many as 2000 Pano devices (8 x 250) within a single deployment.
Each Pano Manager can provide connection management for up to 250 Pano client login screen. Using a
master-slave model, simply create a Pano Manager group, then designate one Pano Manager as the master and the other Pano Managers as slaves. For example, if you want to deploy 400 Pano devices, you need two Pano Managers: the master handles 250 Pano devices, and one slave handles 150.
The master contains all the collections and is used for web logins. Slaves can only be configured to manage Pano client login screen; you cannot configure slaves to perform any other functions. A master Pano Manager coordinates the desktop connections and utilizes resources (distributes load) on the other slave Pano Managers as needed.