High CPU and Disk access

Hi All,

Im running UberSVN #13.2-3153. SVN - 1.7 on Linux Debian squeeze (running as a KVM virtual machine)

Everything works well from an end user point of view but periodically the CPU usage on the server goes to 100% and Disk Access also goes high.

The process using the disk and CPU is Java -Djava.util.logging.config.file=/opt/ubersvn/tomcat/.....etc

There are many of these processes and its just 2 of them going crazy.

The current timings are very regular: 15-16 mins of crazy, followed by 9-10 mins calm.

I dont see anything in syslog of any interest. I have verified there is nothing wrong with the server hardware.

Any suggestions?
Thanks
Tim