The Cisco MDS 9000 SAN-OS Software Release 3.4 has been retired and is no longer supported.
You can view a listing of available Cisco MDS 9000 NX-OS and SAN-OS Software offerings that best meet your specific needs.
If you want support information for the Cisco MDS 9000 SAN-OS Software Release 3.4 documentation, it may be available through Cisco.com Search or in the Cisco Community