#830 FTP aborting transfer: Broken pipe

[jhalldn]

Im getting a whole lot of entries and disconnected peers with my FTP-server. Before FreeNas, i run an old QNAP TS-201 (latest firmware) as a FTP-server and that worked fine. Nothing have changed in my network setup, just the new FreeNas (0.7.2 Sabanda (revision 5543)). This "bug" appear when doing large file transfers. We have tried different clients and different setting (within clients). I googled around for tweaks or answers, other users with the same logs - no luck. I tried to increase [timeout] in settings, but no luck there either. My first thought would be a issue with ZFS, but im not sure. I have run the ZFS tuning extension.
Example:
system.log:Dec 12 18:13:33 <server> proftpd[27701]: <server> (::ffff:<server>[::ffff:<client>]) - notice: user <user>: aborting transfer: Broken pipe