Last night, hfs11 & hfs12 "wigged out" and started returning "busy" for all AFS fileserver requests. This particular event causes certain things on "connected" afs client machines to hang.
Oddly, these machines were rebooted at roughly the same time on Sunday, and had the same (new) version of the AFS fileserver stuff installed on them at that time. Coincidence. Probably not. Anyhow, I've installed the previous version of the volserver/fileserver software so that if they hang again and need to be restarted, they'll restart with the previous (non-hangy) software. Otherwise, a short (15 minute or so) downtime will be scheduled for later this week to switch back to the old code.