Yes, we use 256k with LTO1 drives.   The Emulex FC driver does not have 
the 64k limit.   It really only applies to drivers that use the NT SCSI 
miniport driver, which is most SCSI drivers and some FC drivers.  For 
those you can raise the limit to whatever you want by changing the 
registry parameter maximum_sglist.  Look back in the list archives, it is 
explained in better detail.

Once you have done that you can raise the Netbackup parameter as for other 
systems.   Of course, not all tape drives may benefit from it; but at 
least you will be able to restore from tapes written at larger block 
sizes!

So:   Try it.   Be methodical and read the Veritas paper on tuning 
NetBackup on windows, as you must look at the buffers wait & delay timers. 
 Maybe you just need more buffers.  Often the published values are for the 
days of systems with a few MB of RAM.    Now if you have many GB and you 
have a dedicated media server, use it!

William D L Brown