Hi, To enable auto dop on a new system, I ran the calibrate_io procedure from the dbms_resource_manager package. However the results are a bit strange. The actual latency is reported as 0 and so is the max_mbps. The max_pmbps however is set to 186. Monitoring with collectl showed network troughput of arround 230 MB/s Db version is 11.2.0.2 (64bit) on OL 5.4 (64bit). Storage is NetApp, accessed via dNFS (using 2 1 Gbit/s connections) I searched MOS and google, but no real bugs popped up. What can explain the actual latency and the max_mbps to be set to 0? SQL> @io_callibration.sql SQL> set serveroutput on SQL> set timing on SQL> set echo on SQL> SQL> DECLARE 2 3 l_actual_latency integer; 4 l_max_iops integer; 5 l_max_mbps integer; 6 7 BEGIN 8 9 dbms_resource_manager.calibrate_io 10 ( num_physical_disks => 30, 11 max_latency => 20, 12 max_iops => l_max_iops, 13 max_mbps => l_max_mbps, 14 actual_latency => l_actual_latency 15 ); 16 17 dbms_output.put_line ('max_iops = ' || l_max_iops); 18 dbms_output.put_line ('actual_latency = ' || l_actual_latency); 19 dbms_output.put_line('max_mbps = ' || l_max_mbps); 20 21 END; 22 / max_iops = 11750 actual_latency = 0 max_mbps = 0 PL/SQL procedure successfully completed. Elapsed: 00:53:20.45 SQL> SQL> SQL> select * from gv$io_calibration_status; INST_ID STATUS CALIBRATION_TIME ---------- ------------- --------------------------------------------------------------------------- 1 READY 05-OCT-11 02.56.40.929 PM Elapsed: 00:00:00.00 SQL> SQL> set linesize 150 SQL> column start_time format a30 SQL> column end_time format a30 SQL> column num_physical_disks format 9999 heading NPD SQL> select * from dba_rsrc_io_calibrate; START_TIME END_TIME MAX_IOPS MAX_MBPS MAX_PMBPS LATENCY NPD ------------------------------ ------------------------------ ---------- ---------- ---------- ---------- ----- 05-OCT-11 02.03.20.489842 PM 05-OCT-11 02.56.40.928773 PM 11750 0 186 0 30 Elapsed: 00:00:00.00 Kind regards, Freek D'Hooge Uptime Oracle Database Administrator email: freek.dhooge@xxxxxxxxx tel +32(0)3 451 23 82 http://www.uptime.be disclaimer: www.uptime.be/disclaimer -- //www.freelists.org/webpage/oracle-l