looking at topas (AIX) I can see that the top two hards disks are continously working very hard...
unfortunately I know very little about how hard disk utilisation works on AIX.
I have also noticed that our log4j logging is in debug mode and the logs are constantly being written.
Reading here, http://www.jboss.com/pdf/JB_JEAP4_3_PerformanceTuning_wp.pdf
, it seems that verbose logging could be one of our issues, which ties in with Paul's comment on I/O issues.
Lester I have also thought that our memory usage cycles are odd... We trigger many jobs via quartz (1000's per day) and these jobs (Extract Transform Load) use alot of objects including RMI, and hibernate via Spring. So the creation of so many objects is not such a surprise, however I think we need to tweak our garbage collection config to stop the memory peaking out so often. Can anyone offer any GC tips for such an application?