I have one Oracle 11g server (member of RAC) running over RHEL 5. Its 16 processor and 204GB memory blade server and Fiber Channal SAN storage. Please refer to the screenshot attached, load avg and other performance parameters are normal but still we find this server performance very slow.
If we are logged in as user root and run normal commands on shell like 'ls' , vim, cat, df etc.... we don't see any performance issue.
But if we are logged in as user 'oracle' we see that even command 'ls' takes 10-15 seconds to returnd output. I ran 'top' command and it took about 20 seconds to show TOP screen as attached.
However there is not much load on server, still we see that if we are logged in as user 'oracle' , performance is really slow.
Can someone suggest why is it so happenign and whats the remedy ?