What is IRPStackSize? IRPStackSize stands for I/O Request Packets (IRPs) Stack Size. The count of IRP stack locations used by default for AFD (Ancillary function driver). Specifies how many stack locations the Server service (srv.sys) establishes for I/O Request Packets (IRPs). On some Windows Server 2003 RTM/SP1/R2/SP2 Failover Clusters, it might be necessary to increase this number for certain transports or if you have many file system drivers (and kernel filter drivers such as antivirus programs) installed on the system
