There is no native multipathing in Windows 2003.  MPIO requires a third party DSM (EMC PowerPath) to work in Windows 2003
working at a customer where they have not bought powerpath. they want to use native multipathing. windows native multipathing worked well for windows 2008 server. but getting issues for 2003. how to implement native mpio in windows? array is vmax 20k
Help implementing windows 2003 native mpio