Hello,
I solved the problem with NSYNC (do not know if it was due to the version of firmware3.01.00.3 or modules that I removed before moving to 3.01.00.4).
But, perhaps, I have found another a bug in 3.01.00.3 and in 3.01.00.4 (N5500) and not present in earlier versions (to my memory) and I would understand if it is just my problem before opening a Ticket to Thecus.
Enabling Jumbo Frames and transfer via Windows7 directly from one share to another system appears to freeze and transfer slows down to a few Kb/s
If is not direct but occurs between the PC and the NAS, the speed is adequate; disabling the "jumbo frame" everything works normally.
Another small bug on the Module like Rsync, Rsnapshot etc. ... with the new interface the configuration download page of the module is not working even though the two modules work perfectly (it is however necessary to use an ssh session to upload / download configuration).