If I am right, one problem with this approach is it becomes tricky when both venti servers have updates but yet to be sync'ed. And, in particular, when there are identical data backed up (say, I downloaded a CD image in two machines and backed up in these two servers), it leaves two copies. It may be safe but it does leave two copies.
You are not right. Since venti coalesces writes, it doesn't matter if both servers sync to each other. You'll waste a little bandwidth resending some writes, but you will not end up with multiple copies of a block on the same venti server. Russ
