This doc explains how cdm probe calculate disk IO percentage utilization.
UIM cdm probe for Linux
How cdm probe calculate disk IO percentage utilization.
# iostat -x -d 10 2
It would return 2 blocks of statistics with 10 seconds interval.
probe is not using the first block, it uses the 2nd block only.
For QOS_IOSTAT_PU, probe uses 13th column in the 2nd block.
See sysstat package requirement for cdm probe.