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AIX 6.1 JFS2 Oracle files system, not using much files system cache

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http://unix.stackexchange.com – I am running Oracle database on AIX 6.1, Oracle using JFS2 file systems. Maxperm is set to 90%. This is busy database server, but it is not using the file system cache (less then 2%). The system has 40GB free memory. Is there a reason why file system cache is not used? (HowTos)