With jfs2 have you ensured all all jfs2 cache parameters and all aix tuning parameters including CIO related settings have been checked Fuad On Jun 18, 2009, at 12:12, Joe Armstrong-Champ <joseph.armstrong-champ@xxxxxxxxx> wrote: We have converted about 50% of our oracle database file systems from jfs to jfs2 without any problem. The last one we did caused a slowdown in batch processing by about 30%. Has anyone seen this before? We are running aix 5.3/oracle ee 10.2.0.3. Thanks. Joe -- //www.freelists.org/webpage/oracle-l -- //www.freelists.org/webpage/oracle-l