Volumes

In BS2000 there are public and private volumes and also Net-Storage. Only disks can be public volumes.
Net-Storage does not belong to the public volumes, but is used to extend them. With respect to the device type, Net-Storage in BS2000 is regarded as belonging to the group of disks.
Private volumes are all tapes and those disks which are not marked as public disks. Both types of volumes can be used together.

In the definition of disks, DMS distinguishes between public volumes, which are grouped into pubsets, and private disks. Net-Storage volumes are used to extend pubsets. As of BS2000 V21.0A besides the conventional Net-Storage volume of type NETSTOR a second Net-Storage volume of type NETVOL is introduced.

All volumes in BS2000 are identified by a name of up to six characters. This name is referred to as VSN (volume serial number) or archive number. Any of the alphanumeric characters A..Z, 0..9 and the special characters period (.), @, # and $ may be used in the name. Pubset volumes can be distinguished from other volumes by their VSN where the VSNs of public volumes are subject to a convention: they must begin with the string “PUB” or contain a period in the third, fourth or fifth position. This VSN syntax may not be used for private disks and Net-Storage volumes.

DMS manages the storage space on disks. Some control functions (access authorization, saturation control, etc.) can only be used on a pubset, not on private disks or Net-Storage.