The following terms are used in BS2000 when working with Net-Storage:
Net server
A file server in the worldwide computer network which provides storage space (Network Attached Storage, NAS) for use by other servers and offers corresponding file server services.
Net-Storage
Storage space provided by a net server in the computer network and storage space released for use by foreign servers. Net-Storage can be a file system or also just a node in the net server’s file system.
Net-Storage is connected to a BS2000 system using the MOUNT-NET-STORAGE command. The Net-Storage (more precisely: the released directory) is actually mounted on the net client. The Net-Storage is disconnected from the BS2000 system using the UMOUNT-NET-STORAGE and unmounted from the net client.
You use the SHOW-NET-STORAGE command to request information on the Net-Storage available in the BS2000 system.
The following are approved as Net Storage systems: ETERNUS CS with NAS interface and NetApp ONTAP systems. Other net servers require special approval.
Net client
Implements access to Net-Storage for the operating system using it.
In BS2000 the net client, together with the BS2000 subsystem ONETSTOR, transforms the BS2000 file accesses to corresponding UNIX file accesses and executes them on the net server using NFS.
The net client on an SU /390 is the HNC, and on an SU x86 the carrier system X2000.
Net-Storage volume
Net-Storage volumes represent Net-Storage in BS2000 in the context of data pubsets.
As of BS2000 V21.0A, there is a second Net-Storage volume type NETVOL in addition to the previous Net-Storage volume type NETSTOR.
As of BS2000 V21.0A, the ADD-NET-STORAGE-VOLUME command is always used to set up Net-Storage volumes of the NETVOL type and assign them to a pubset. In this case a directory is configured in the released file system of the net server and assigned to a local data pubset (SF or SM) in the form of a Net-Storage volume. Existing Net-Storage volumes of the NETSTOR type will continue to be supported in BS2000 V21.0A.
Both Net-Storage volumes of type NETVOL and of type NETSTOR due to compatibility reasons are addressed by means of their Volume Serial Number (VSN) and the type NETSTOR. The directory name in the net server’s released file system and the VSN of the Net-Storage volume are the same.
A Net-Storage volume (more precisely: the directory with the name of the Net-Storage volume on the net server) contains the following files (see also the next page):
A file system label (file name .FSL)
The users' BS2000 files
User-specific directories with the users' node files
Information on the Net-Storage available in a data pubset can be requested using the SHOW-PUBSET-NET-STORAGE command.
Notation of Net-Storage volumes
Irrespective of the pubset type, the Net-Storage volume’s VSN is by default derived from the pubset name:
In the case of a one-character pubset name, PUB notation (e.g.
PUBA00) is assumed and the Net-Storage volume’s VSN is formed by replacing the “U” in the “PUB” string by “@” (e.g.P@BA00).In the case of a multiple-character pubset name, point notation (e.g.
OTTO.0, ABC.00) is assumed and the Net-Storage volume’s VSN is formed by replacing the period by “@” (e.g.OTTO@0, ABC@00).
Only the standard Net-Storage volume in the pubset can be named using this notation.
Multiple Net-Storage volumes for a pubset
When multiple Net-Storage areas on one or more net servers are to be assigned to a pubset, the Net-Storage volumes must be assigned with different VSNs. As only one Net-Storage volume with a standard name can exist per pubset, further Net-Storage volumes must be assigned to the pubset with explicitly defined VSNs (as with private disks).
Net-Storage file
Designates a file which is created on a Net-Storage volume. On Net-Storage a distinction is made between the two file types BS2000 file and node file.
BS2000 file
Designates a file which is created and processed exclusively by BS2000. BS2000 files on Net-Storage (FILE-TYPE=BS2000) are supported. They reside directly on a Net-Storage volume. Open systems may only access them in read mode.
Node file
Designates a Net-Storage file (FILE-TYPE=NODE-FILE) which can be created and processed both by BS200 and by open systems. Node files are supported since BS2000 OSD/BC V10.0. They reside on a Net-Storage volume in a user-specific directory (name of the user ID), and the file names comply with the BS2000 naming conventions. BS2000 supports PAM node files and SAM node files.