Solaris

No problem man, I'm sure you can get to the bottom of this. Good night!

---------- Post updated at 09:13 AM ---------- Previous update was at 09:09 AM ----------

EDIT: Here's a link with some great software tools to identify a motherboard. I'm sorry to say they are all Windows based, but I'm sure that can give you a place to start. I believe there are comparable tools available for *nix systems, although I don't have any specific suggestions.

---------- Post updated at 09:15 AM ---------- Previous update was at 09:13 AM ----------

EDIT: Last link, this one for a technique to identify it from directly from the BIOS.

OK updated the motherboard BIOS to the latest version and the problem still exist.

Can you duplicate the problem with another OS? Perhaps try booting off a Ubuntu live cd or something and see what happens. That can help narrow it down to a hardware or software problem.

Can you share the model of your motherboard? A lot of times there's specifics on how the NIC was implemented that can help.

Well all this seems very familiar to me. I used to own a group of IT companies and one of them was a storage distributor. We saw large transfers throttling back (to almost nothing) quite regularly and it caused all sorts of support calls to our storage help desk.

My advice is to look at Windoze as the culprit. You've searched Google so you probably already know that there have been raging arguments and bust-ups over this, for example:

Are You Seeing Slow Windows 7 Network Performance?

Unfortunately I can't just prescribe a cure; I can only sympathise. You are not alone!!!!

What Windoze version are you using exactly? Even using a different (older) version may not fix it!!!!!! Good old MS!

Try using a different protocol to test your transfer speeds eg. FTP between Windows and OI. Also see the performance difference if one node or the other initiates the transfer.

Sorry to be so vague but I reckon you can forget about OI being the problem.

Hope that helps.