z/OS has both MVS datasets, and Hierarchical File System (HFS) files. As both types must be accessed by the SFTP server, there must be a mechanism for distinguishing between them. Traditionally, MVS datasets in z/OS are accessed using the filename format
//'NAME.OF.MVS.DATASET', while HFS files are accessed using the filename format
In z/OS, if a dataset name is not enclosed in single quotes, the user prefix is added in front of the dataset name. For example, if user
USER1 has a dataset
DATASET.NAME1, the user can access it using the dataset name
//DATASET.NAME1. It is also possible to use an absolute prefixed name
z/OS has also library datasets, whose members are accessed using the dataset name
System symbols can be used in dataset names and volume serial numbers. The symbols are resolved on the host where the dataset resides.