We're having to copy its data to another machine to get two machines doing the directory thing, and the original directory server doesn't have a gigabit network card in it, so it only copies at 10 MB/second...
With the second machine we're going to experiment with some changes to make the directory faster. Once that work is done, we can apply it back to the original directory server. Also: with 6 new database servers coming, we'll have a lot of extra database servers left-over which we can use for the directory.
Yes, the directory has been neglected for a while, but now that we're starting to get some free time, it's becoming a priority again.
Update: back up.