BS2000 supports files and volumes with a capacity of up to 4 terabytes. Files and volumes which exceed 32 GB are known as “large files” and “large volumes”, and together they are referred to as “large objects”.
On all BS2000 servers, large volumes can be configured on the external disk subsystems which are connected via FibreChannel.
Large files and large volumes are only supported in special pubsets, which must be assigned attributes for using these large objects. These pubsets are also called “large pubsets” and can be imported on all BS2000 versions which are currently released.
In certain data structures, including the catalog entry, the 3-byte fields that have been used for page addressing must be converted to 4-byte fields.
Converting 3-byte fields to 4-byte fields affects all components, products and applications that work directly or indirectly with these fields. The TPR interfaces have been modified accordingly, but not all of the TU user interfaces can compatibly support these large files.