I performmed the nmon command.
Used K Set Text Data I/O Use io other repage
27048 5.0 6040 5336 472 4864 0 1% 11 0 0
fileserver
24784 1.5 40320 40172 4 40168 0 8% 0 0 0 java
3140 0.5 412 36 4 32 0 0% 0 0 0 syncd
1916 0.0 504 68 20 48 0 0% 0 0 0 qdaemon

I looked at the fileserver process (27048) which has considerable io

ps -ef|grep 27048
UID PID PPID C STIME TTY TIME CMD
root 27048 8884 10 Aug 17 - 233:10
/usr/afs/bin/fileserver
Looking at this line I can see this process is cpu intensive and has a
scheduling penalty of C=10
Also this process is concerned with afs. This one could very well be
it.

A software call with ibm support has also been made. I'm curious to
see how they plan to tackle this problem. Therefore I will wait before
restarting this process.

I'll will post the outcome/results once I have them.

Raix.