For Linux I use the native MPIO tools that the operating system provides, with the exception of Windows prior to 2008. (We can use either native or our own MPIO plugin with Windows 2008 and greater)
The Linux version is called DM-MPIO and should be present in all modern Linux distributions. You should check the NetApp Interoperability Matrix to make sure the RHL system, FCP cards, etc., are supported by NA.
i have 1Gbit eth card. There are not too much I/O at all, this is just test server, and small DB. it took more than 12 hours for things usually only took about less than half hour. Are there anything I can tune?