Both Vantage web client and Vantage windows client are giving the error "VKG0844I No Disk Data Set Found For Object=VISTMCD", when tried to access the CA1 Flexible Storage Files (object tree -> Tape Management Systems -> CA Flexible Storage -> Files ).
Run the DSKTMCF script which forces collection of the data for this object. The easiest way would be to navigate to the VISTMCD object and open the 'ACTIONS' drop-down menu, and select 'Configure DSKTMCF'.
Scheduling can be defined for this script to have it run periodically, such as every day. After configuring it, the script also have to run by selecting 'save, activate, execute' option on the Final screen in the script wizard.