Just a small update:
Jumbo frames have been disabled and are probably going to stay that way.
I can't complain too much here. but it's been up and stable so far (6 days, 22 hrs, nothing note-worthy I might add), NFS speeds currently are between 21-28mb/s which is sufficient enough, but is hardly spectacular either considering I've milked 40+ out of this thing before.
The "small update" part I state is regarding a(nother) *possible* bug here with FTP. We're using on our backup server CentOS/ncftpget and it fails on one of our larger ntbackup bkf files which is currently 123GB in size. With about 50 seconds to go at the ~121GB mark, it craps out with "Remote host has closed the connection." - wouldn't it be great to have more daemon feedback on the Thecus? Maybe I might be able to resolve why it consistently dies at this point and only at a file this large... or maybe it's just an ncftp issue? I suppose I couldn't rule that out yet, but it's a pretty fat chance.
So now I fell back to just using NFS copy operations instead. (for some reason, FTP was.. on average, 5-10mb/s faster or so.)
Alright, I'll stop now... this wasn't quite as small of an update as I stated it to be.