12-20-2016 06:08 AM
The 7800 requires at least FOS 7.2.1d (see target path documentation (TP)), personally I am moving toward FOS 7.4.X in general which is the current TP but that depends on the rest of the environment and connected devices.
Brocade Target Path documentation is a good starting point and the vendor matrixes of qualified code. TP
Further, what kind of traffic is flow over the switch - FICON etc. And which features are used are used on the 7800.