rsync - missing one or more directories?

[Dan Stromberg]

I am running:

+ cd /oas
+ rsync -a --rsh=/usr/bin/ssh --rsync-path=/dcs/packages/gnu/bin/rsync
--progress root at sherlock1.oas.uci.edu:/oas .

...and I can see that it sometimes transfers some files, however, it
appears to be consistently missing this directory:

/oas/projects/pers/oct2004

What might cause this?

Thanks!