Du process keeps popping up

Running 10.4.11 xServe. 2 x 250GB RAID config. Over the past 2-3 days the "du" process shows up and keeps hanging the server. It hangs for about 2-3 minutes then resumes as normal. The server itself feels very slow. 31 bounces for Activity monitor to open up as an example (while the du process is running)
Force quitting "du" brings the server back to life, but it keeps popping up.
RAID drives appear to be fine, but when I try to verify disk on the RAID, disk utility locks up. Only a hard reboot can bring me back out of it. 141GB available on the RAID, so it's not a space issue.
Thanks
Any ideas what would be causing this?

What kind of frequency does this occur? hourly? daily? on no particular schedule?
You may need to get familiar with the command line utility ps. It can tell you far more information about a process, including things like its parent process (the task that invoked it). Eventually, working up the process tree, you'll be able to find the source (e.g. either a user, cron task, launchd, etc.)
Start off with ps -awxj when the du is running and look for the du process. The third column in this output is the Parent PID (PPID), which is the process that called du. Continue up the tree, looking for that PPID's parent until you find the culprit. Then you can decide what action to take.

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