Abstract: Some aspects of the disclosure describe a method for testing a storage controller by emulating storage area network (SAN) topologies and vendor-specific behavior in the storage controller. The method can include detecting, via a processor in the storage controller, a physical storage device connected to the storage controller. In response to detecting the physical storage device, the method can determine logic unit numbers (LUNs) based on device characteristics of the physical storage device, and determine a SAN topology to emulate, wherein the SAN topology defines paths leading to the LUNs. The method can also include updating, via the processor, configuration information used by components of the storage controller to indicate the paths leading to the LUNs. The method can also include detecting an input/out request that requires data associated with the LUNs. The method can also include determining, using the configuration information, the data associated with the LUNs.