BS2000 in general

The following general conditions must be observed in BS2000 when working with Net-Storage:

• A Net-Storage volume can only be assigned to one data pubset. No Net-Storage can be assigned to the home pubset.

• A file on Net-Storage consists of just one extent. Specification of a volume list is accepted, but only the first volume is used.

• Storage space assignment can be specified in the SPACE operand of the CREATE-FILE and MODIFY-FILE-ATTRIBUTES commands, but no storage space of this size is occupied on Net-Storage. The (maximum) storage space assignment takes place only when the file is stored in the corresponding size.

• With respect to allocation, a Net-Storage volume behaves like an NK2 disk with the minimum allocation unit of 8 KB.

• Absolute allocations are not possible for files on Net-Storage.

• Files with the following attributes cannot be created on a Net-Storage volume:

  • Files with a PAM key

  • Work files

  • Temporary files

  • File generation groups

• An SMPGEN run is aborted if pubsets with files on Net-Storage are edited. Catalog entries of files on Net-Storage must be removed or exported from the pubsets concerned before the SMPGEN run takes place, e.g. with

  /REMOVE-NET-STORAGE-VOLUME ...,FILES-ON-VOLUME=*EXPORT

• When a pubset to which Net-Storage volumes are assigned is renamed using PVSREN, any volume which exists is also renamed accordingly with the standard name (P@BX00, XY@000, etc.). Net-Storage volumes with user-defined names are not renamed.

• The administrator of the file server can grant access to public files on Net-Storage for applications which run on different operating systems. The following must be borne in mind here:

  • Applications of foreign operating systems (not BS2000) have only write access to files of the type *NODE-FILE.

  • Data access control in BS2000 is effective only if access takes place from BS2000. Otherwise it has no effect.
    Example
    Setting up shareability of a file in BS2000 with /MODIFY-FILE-ATTRIBUTES <file name>,USER-ACCESS=*ALL-USERS is only valid in BS2000. For a foreign system, access is still restricted.