Tomcat 6 + Subsonic 3.7 Permanent disk access issue

Hi,
i have ubuntu 9.04 with fresch installed Tomcat 6. then i install subsonic 3.7 and enabled SSL in tomcat.
now all runs fine with subsonic.
but i have permanent disk access when i start tomcat. i tried to run tomcat without subsonic, the diskaccesses still there. with subsonic averagely every 5 seconds, and without subsonic averagely 9 second is there a disk access.
if i shut tomcat off there are no more disk accesses.
because this is a server on thats tomcat runs 24/7, its a big issue for me. it hurts the lifetime of the disk, and the hard drive can not get in standby.
so how can i change this behavior, so there is no more disk access from tomcat or subsonic?
i have ubuntu 9.04 with fresch installed Tomcat 6. then i install subsonic 3.7 and enabled SSL in tomcat.
now all runs fine with subsonic.
but i have permanent disk access when i start tomcat. i tried to run tomcat without subsonic, the diskaccesses still there. with subsonic averagely every 5 seconds, and without subsonic averagely 9 second is there a disk access.
if i shut tomcat off there are no more disk accesses.
because this is a server on thats tomcat runs 24/7, its a big issue for me. it hurts the lifetime of the disk, and the hard drive can not get in standby.
so how can i change this behavior, so there is no more disk access from tomcat or subsonic?