CAS_DISK_CACHE is not the only storage location for consideration... but I did just release a post about it in Communities: Provisioning CAS_DISK_CACHE For SAS Viya. And yes as noted above, xfs is preferred and so is ext4. Avoid ext3 and any kind of NFS-based storage for CAS' cache.
You have the option to rely on shared file system solutions for loading data into CAS, like NFS or a SAN or even HDFS. These among other topics are covered in several other posts of mine as well:
4 Approaches for Parallel Data Loading to CAS https://communities.sas.com/t5/SAS-Communities-Library/4-Approaches-for-Parallel-Data-Loading-to-CAS/ta-p/370955
Contemplating shared file systems for SAS https://communities.sas.com/t5/SAS-Communities-Library/Contemplating-shared-file-systems-for-SAS/ta-p/468263
Contemplating I/O for SAS https://communities.sas.com/t5/SAS-Communities-Library/Contemplating-I-O-for-SAS/ta-p/459472
Some of those link to white papers published by Margaret and her team.
HTH,
Rob
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