BS2000 supports both disks with PAM keys (K disks) and disks without PAM keys (NK disks). HSMS can use both types of disks. HSMS reads and writes files with all PAM key formats (BLOCK-CONTROL-INFO=*NO/*WITHIN-DATA-BLOCK/*PAMKEY).
Files can be saved to and restored from NK4 disks. For details of the boundary conditions that apply to restoration from NK4 disks, see the section “NK4 disks” in the “ARCHIVE” manual [2].
By default, files are loaded during read operations in the same format in which they were saved, as long as this is permitted by the format of the volume to which they are written.
Partial backup is not possible for PAM files without PAM keys (BLOCK-CONTROL-INFO= *NO), except in the case of PLAM libraries.
In BS2000/OSD-BC V9.0 and higher, a pubset can be provided with additional storage space which a net server makes available as a Net-Storage volume. From the BS2000 viewpoint a Net-Storage volume is a disk with the volume type NETSTOR or NETVOL. NETVOL volume type is only available in BS2000 V21.0A and higher.
Files on Net-Storage are saved and restored like files on local pubset disks. When restored, files can be written to Net-Storage. Save files can be created on and also copied to Net-Storage.