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 family of disks.
When defining disks, DMS distinguishes between public volumes, which are combined to form pubsets, and private disks. Net-Storage volumes are used to extend pubsets.
Net-Storage volumes can be assigned to a pubset. They are not, however, a component part of the pubset (IMPORT-PUBSET is also possible when the assigned Net-Storage volumes cannot be accessed).
Each pubset contains a user catalog and its own file catalog. Specifying NET-STORAGE-USAGE=*ALLOWED in the user entry specifies that the user may occupy storage space on Net-Storage.
All volumes are identified in BS2000 by a name which may be up to six characters long. This name is referred to as the VSN (Volume Serial Number). The valid character set consists of the alphanumeric characters A..Z, 0..9 and the special characters period, @, # and $. 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.
Default names of Net-Storage volumes which are assigned to a pubset have a special format depending on the pubset notation, see the section “Notation of Net-Storage volumes” in chapter "Terms".
DMS handles storage space management on disks. Some control functions (access authorization, saturation control, etc.) can only be used on a pubset, not on private disks or Net-Storage.
After Net-Storage volumes have been assigned to a local pubset, BS2000 users can utilize them via the interfaces of DMS if this is permitted in their user entry. The available storage space on Net-Storage is then limited only by the size of the released storage space on the net server.
See the “Introductory Guide to DMS” [19].
Files on Net-Storage can be created both by BS2000 and by open systems and processed jointly by these, see section "Interoperability on Net-Storage". Details of the hardware and software requirements for this are provided in the current Release Notice for BS2000.