file copy hangs at around 50mb then continues after a few seconds
nw65sp5 + n65nss5a clustered iscsi volumes

Smaller files copy fast, but anything over 50mb the progress bar will
stop approximately at the 50mb mark, hang, then continue after a few
seconds. This also seems to freeze the entire volume. ie other users get
the lock.

All network adapters have low utilization (including iscsi)

looking for places to check