When considering Delivery Controller performance tweaks, study the following.
On large XenDesktop sites, you might be creating more than one delivery controller. If that is the case, use SQL mirroring for fast failover. SQL mirroring is all about the high availability of the SQL database. Mirroring works on a per-database level and works with databases that use the full-recovery model. One server acts as the primary or principal server that serves clients, and the other server acts as a hot standby mirror server. Hot standby means rapid failover without data loss.
Database mirroring can use either a synchronous or asynchronous operation. Asynchronous updates hit each database immediately, while synchronous updates hit both databases in synchronization with each database at the cost of latency. Synchronous operation is considered high-safety mode and is more protective of data. Asynchronous operation is considered high-performance as it writes...