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Using what protocol? From what guest(s)? Etc...
SMB from windows 7 64bit....nic is intel pt1000
Did you use copy tools like Teracopy?
If so delete them and try a pure copy
What speed Do you get?
why not replace OI with solaris express? I did and the speeds are blistering (to me anyway) - Writing and copying from my nas to a machine with a WD black will max my gigabit network out.
even a WD blue 2.5" reaches the full speed it can (based on a crystal disk benchmark)