You may encounter a saturation of partition /opt/nimsoft/hub/q/qos/ on the collector UIM / primary HUB. This directory might be filled with a huge amount of .SDS files, and may consume hundreds of GBs.
Release : 20.4
CA UIM 20.4.7
CentOS 7.6
This issue might be caused by the overfilled database, which is running out of space.
There are two folders named qos_processor_qos_baseline and qos_processor_qos_message under "/opt/nimsoft/hub/q/ where the .sds files are backing up and size is continuously increasing.
qos_processor_qos_baseline and qos_processor_qos_message are the queues that are created by qos_processor.
These folders contain data in the form of .sds files which should be consumed by the qos_processor probe and whenever the hub sends data successfully, these files are deleted by hub - however, if the database is full and the hub / data engine cannot insert the most recent data to the database, the .sds files will be stacking up.
Make sure that your database is not running out of space - if it is, assign additional space to the database.