Dbvisit Standby makes use of a Dbvisit Archive Destination referred to as ARCHDEST (on the standby server) and ARCSOURCE (on the primary server)
This is used to store the archive logs shipped from the primary server to the standby server. This location is NOT the same as the database archivelog destination.
This location should be big enough to keep at least 1 to 2 day's worth of archive logs, but the capacity to store three days or more is recommended.
Example, if you generate 2GB worth of redo (archive logs) on the primary in one day, you should have at least 2GB as an absolute minimum free space on the standby in the folder specified as the ARCHDEST.