Unable to capture disk IO needs in performance reports
Tried to upgrade the cdm probe as well to version 6.20 and 6.30 but still not able to capture any IO related performance data. 

incorrect path variable entered in the Controller probe
 

UIM 8.51
cdm 6.30 (also tried 6.0)

Red Hat Enterprise Linux Server release 7.2 

First verify that the iostat messages for related devices are populated in logs and call_back.
Use the DR Nimbus as well.

On the affected robot -> Open controller probe -> Setup -> Environment 

Ensure that the variable PATH is not customized with different values. Compare with a working robot and update accordingly.

In this example the correct path was:

"/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/root/bin"

Restart controller and cdm probe

Required metrics started to populate the Reports.