With a GoldenGate HUB design, there are several factors to consider when designing the overall strategy for disk use with DBFS.
When defining XAG failover, the DBFS disk could be split in the following manner:
"Common" DBFS disk created specifically for administrative overhead for the GoldenGate instance specifically.
DBFS disk created specifically for use for:
parameter files - dirprm
report files - dirrpt
checkpoint files - dirchk
Bounded recovery - BR
Further you would create a disk for an individual project specifically this can be any size.