Repair taking a long, long time

[Maxim Potekhin]

We have something of the order of 200GB load on each of 3 machines in a 
balanced cluster under 0.8.1.
I started repair about 24hrs ago and did some moderate amount of inserts 
since then (a small fraction of
data load). The repair still appears to be running. What could go wrong?
Thanks,
Maxim