Michael, take a look at this post by one of my colleagues
https://communities.sas.com/t5/SAS-Communities-Library/Provisioning-CAS-DISK-CACHE-for-SAS-Viya/ta-p/603689
It discusses how CAS uses both memory and disk. CAS can process data that is bigger than the available memory. But you must have enough "resources" (memory+data) available, and if you are getting near the limits of that on you hardware then you will have problems. Hope that helps.
... View more