Abstract: Provided are a system and article of manufacture for providing an address format compatible with different addressing formats used for addressing different sized address spaces. An address format is used in an operating system to address storage space in a storage device comprising a first region and a second region of storage space. A first group of applications uses the address format to only address the storage space in the first region and is not coded to use the address format to access the second region and a second group of applications uses the address format to address the storage space in the first and second regions.

Abstract: Provided is a method, system, and article of manufacture for providing an address format compatible with different addressing formats used for addressing different sized address spaces. An address format is used in an operating system to address storage space in a storage device comprising a first region and a second region of storage space. A first group of applications uses the address format to only address the storage space in the first region and is not coded to use the address format to access the second region and a second group of applications uses the address format to address the storage space in the first and second regions.

Abstract: Aspects for data sharing across batch sequential processes and on-line transactional processes in a clustered arrangement of multiple data processing systems are described. In a method aspect, the method includes performing on-line transaction process accesses and batch sequential process accesses on record data. The method further includes utilizing a dual-level locking protocol for the on-line transaction process accesses and batch sequential process accesses to achieve substantially concurrent accessibility to the record data with minimized processing overhead for the batch sequential processes.

Abstract: A method and system for transparently recovering from a coupling facility failure are disclosed. In one method embodiment, the present invention determines, following the failure of a coupling facility, which data was previously assigned to that coupling facility. The present embodiment then prevents access to that failed coupling facility. Next, the present method embodiment selects a new storage location for the data which was previously assigned to the failed coupling facility. The present embodiment then assigns the data previously assigned to the failed coupling facility to a new storage location. In the present invention, the aforementioned steps are performed without requiring preallocation of white space in an alternate coupling facility.

Abstract: Aspects for data sharing across batch sequential processes and on-line transactional processes in a clustered arrangement of multiple data processing systems are described. In a method aspect, the method includes performing on-line transaction process accesses and batch sequential process accesses on record data. The method further includes utilizing a dual-level locking protocol for the on-line transaction process accesses and batch sequential process accesses to achieve substantially concurrent accessibility to the record data with minimized processing overhead for the batch sequential processes.

Abstract: Aspects for data sharing across batch sequential processes and on-line transactional processes in a clustered arrangement of multiple data processing systems are described. In a method aspect, the method includes performing on-line transaction process accesses and batch sequential process accesses on record data. The method further includes utilizing a dual-level locking protocol for the on-line transaction process accesses and batch sequential process accesses to achieve substantially concurrent accessibility to the record data with minimized processing overhead for the batch sequential processes.

Abstract: A method and system for transparently recovering from a coupling facility failure are disclosed. In one method embodiment, the present invention determines, following the failure of a coupling facility, which data was previously assigned to that coupling facility. The present embodiment then prevents access to that failed coupling facility. Next, the present method embodiment selects a new storage location for the data which was previously assigned to the failed coupling facility. The present embodiment then assigns the data previously assigned to the failed coupling facility to a new storage location. In the present invention, the aforementioned steps are performed without requiring preallocation of white space in an alternate coupling facility.

Abstract: A method of taking a backup copy of a data set, for use with a log, with the data set being open for update by multiple updaters is described. A point on the log is identified (Recovery Time) from which it can be ensured that all data updates identified on the log have been written by an updater from buffers to the data set. This is done by recording a Recovery Time, and then not taking the backup until all the updaters have confirmed that they have written all updates from buffers to the data set. In addition, if tokens are used on the log to avoid having to identify the data set in full, then these are also written to the log before the update is taken.