if the filesystem gets completely filled up, do hammer viconfig and shorten snapshot retention time. then run hammer prune, and maybe hammer reblock as well.
####time machine
+I gave up on all this. Backing up with Time Machine usually works for some time (a half-through backup) and then cnid_metad gets a fit and thinks it's a good idea to force the exported volume read only. Backup fails and you have to start over. I heard this got even worse with Lion. I'm going to backup my important stuff with rsync and NFS.
+
net/netatalk<br>
net/avahi