Strange memory behavior

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http://www.unix.com – Hello together, i have a strange memory behavior on a AIX 7.1 System, which i cannot explain. The Filesystem-Cache will not be grow up and drops often after few minutes. I know if a file was deleted, that the same segment in the FS-Cache will also be cleared. But i am not sure if this is the correct explanation for "my" behavior. In one test i read a file (dd if=<some file> of=/dev/null) and after the dd finished the fs-cache (file pages) immediately droped out of the memory, but i couldn't reproduce this test. Does anyone have an idea? Thanks P.S. - tunables like vmo or (HowTos)