Maybe this helped . . .
Dave,
So we stopped the copy, rebooted both machines, cleared their caches, rebooted again, and restarted the 3Com switch.
The disk image mounted easily, and we re-started the copy. It's currently copying around 37 MB/s, although it hits faster speeds from time to time. (See image below.)
I suppose it could always hang up/slow down again, but at least the math doesn't indicate it's going to take three weeks.
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