I checked our CENTOS 4.5 server /var/log/messages and found almost every second have message in it. This server just setup ORACLE 10GR2 RAC and OCFS2 file system. Can anyone tell me where is message come from and how to reduce it? Thanks. ==== /var/log/messages ------- Jul 25 15:55:30 RAC2 su(pam_unix)[12678]: session opened for user oracle by (uid=0) Jul 25 15:55:31 RAC2 su(pam_unix)[12678]: session closed for user oracle Jul 25 15:55:33 RAC2 su(pam_unix)[12713]: session opened for user oracle by (uid=0) Jul 25 15:55:33 RAC2 su(pam_unix)[12713]: session closed for user oracle Jul 25 15:55:33 RAC2 su(pam_unix)[12742]: session opened for user oracle by (uid=0) Jul 25 15:55:34 RAC2 su(pam_unix)[12742]: session closed for user oracle Jul 25 15:55:35 RAC2 su(pam_unix)[12777]: session opened for user oracle by (uid=0) Jul 25 15:55:36 RAC2 su(pam_unix)[12777]: session closed for user oracle Jul 25 15:55:37 RAC2 su(pam_unix)[12806]: session opened for user oracle by (uid=0) Jul 25 15:55:37 RAC2 su(pam_unix)[12806]: session closed for user oracle Jul 25 15:55:39 RAC2 su(pam_unix)[12841]: session opened for user oracle by (uid=0) Jul 25 15:55:39 RAC2 su(pam_unix)[12841]: session closed for user oracle Jul 25 15:55:40 RAC2 su(pam_unix)[12870]: session opened for user oracle by (uid=0) Jul 25 15:55:40 RAC2 su(pam_unix)[12870]: session closed for user oracle Jul 25 15:55:41 RAC2 su(pam_unix)[12905]: session opened for user oracle by (uid=0) Jul 25 15:55:42 RAC2 su(pam_unix)[12905]: session closed for user oracle Jul 25 15:55:42 RAC2 su(pam_unix)[12934]: session opened for user oracle by (uid=0) Jul 25 15:55:42 RAC2 su(pam_unix)[12934]: session closed for user oracle Jul 25 15:55:44 RAC2 su(pam_unix)[12971]: session opened for user oracle by (uid=0) Jul 25 15:55:45 RAC2 su(pam_unix)[12971]: session closed for user oracle Jul 25 15:55:45 RAC2 su(pam_unix)[13000]: session opened for user oracle by (uid=0) Jul 25 15:55:45 RAC2 su(pam_unix)[13000]: session closed for user oracle ____________________________________________________________________________________ Need a vacation? Get great deals to amazing places on Yahoo! Travel. http://travel.yahoo.com/ -- //www.freelists.org/webpage/oracle-l