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As zxmaus says. Your pgspout is very high so it draws down your rootvg overall. Your 6GB has 90% computational pages and is using paging space as stated.

I guess there is not that much of tuning...

Check the Redbook pages of IBM and enter "AIX Performance" as search string. For database, especially Oracle tuning just add database or oracle to it when searching the Redbooks.
Also again: Check...

As shockneck said and I also stated in my 1st post - it is very important (lru_file_repage=0).

Also it doesn't do any harm to set

chdev -l aio0 -a maxreqs=32768 -P

so you run against limits...

Having maxperm% and maxclient% around 30 is an old way of tuning. As shockneck said, lru_file_repage is being used since some time now and while using this, the maxperm% and maxclient% are usually...