DBMS_RESOURCE_MANAGER.calibrate_io on X5-2

Hi, we just installed a X5-2, and wanted to do some tests on the storage.  We ran a script that calls DBMS_RESOURCE_MANAGER.calibrate_io, and the results left me thinking if I'm doing something wrong.

Some points to consider:

• Two-node RAC (odb-04)
• Database files were created on ACFS, not directly on ASM diskgroups (done automatically by the deployment process).
• I've read that when you run DBMS_RESOURCE_MANAGER.calibrate_io, you use the number of disks in DATA diskgroup as the first parameter for the procedure (num_physical_disks).
• DATA diskgroup was created with 16 disks (info. from v$asm_disk), so I used that number as the firs input parameter for calibrate_io.