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Load-balancing and Fail-over


In the digital signage software industry, load balancing distributes workloads across multiple QL servers. It aims to avoid the overload of a single server resource. Using load balancing increases reliability and availability through redundancy and failover capabilities.

Choosing load balancing doubles the number of concurrent players supported.

1 server A3 2 servers A4 3 servers A4
Players hosted by QL Server 1625 players 3750 players 7500 players
Player downloading concurrently* 325 players 750 players 1500 players
CPU usage average 90% 90% 90%


Server technical profiles are measured based on Microsoft Azure offering.

Size CPU Cores Memory Max IOPS
A4 8 14GB 8000
 A3 4 7GB 4000

Operating system: Windows Server 2012.

These metrics are based on Azure media storage hosted by a virtual shared drive to which all IIS servers can access to. It is intended to store content. It must be a virtual shared drive compliant with SMB 3 protocol.

Note: The maximum number of players downloading simultaneously is independent from the amount of players the QL platform can effectively manage. It is quite possible that a determined configuration can support up to 10 times more players than the indicated number, because generally a platform is shared by several clients who do not necessarily all download at the same time.
QL player features a queuing system. If your server has to handle a higher number of downloads and reach its maximum capacity, QL software will implement a queuing system for players beyond the maximum capacity of your platform.

  • QL Server comes with a queuing system processed sequentially.