Looks like a good sign. As bakunin said - just have a look on it maybe twice every week or have a script informing you every day in the morning as a report. Anyway it might be a good idea to split...
As he said he is using AIX 6.1 I strongly doubt that he is using jfs. jfs is somewhat out of date and very limited. If he is using jfs, I strongly recommend changing that.
I am not sure if there is not just an intial impact that might occure just because of intense traffic when starting up everything after a boot. I would tend to monitor those counters if they increase...
Have you checked what processes are running currently? There can be several different reasons for that. Do you have a disk bottleneck (iostat) or network? Does DB2 have some internal trouble like...