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AssigneeInternational Business Machines Corporation
InventorsStephen Merritt Branch, Patricia Driscoll Choi, Edward H. Daray, Jr., Mark Edward Thomen
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A method and system for sharing a catalog in a multiprocessor system is disclosed. The multiprocessor system includes a plurality of host systems. The method and system comprises storing a copy of an entire volume data record of the catalog in a processor. Thereafter, the method and system comprises reading sharing information of the catalog from the processor to the appropriate host system when the appropriate host system needs access to the catalog. For example, in a S/390 parallel processor system an enhanced catalog sharing system (ECS) is utilized in conjunction with the catalogs. In this type of system, a copy of the entire data VSAM volume record (VVR) for an ECS-active catalog is stored in a coupling facility processor. This processor is accessed using components of the S/390 product. When an ECS-active host system needs access to an ECS-active catalog, the sharing information is read in from the coupling facility processor instead of a DASD volume. If the shared catalog request involves an update to the ECS-active catalog, the (VVR) in the coupling facility is updated; no writes are performed to DASD for updates to the sharing subcell. By storing the sharing control data on a shared processor, the I/O operations and the disk lock outs are eliminated, dramatically decreasing elapsed time for a shared catalog request and increasing the availability of the disk device. This results in a significant performance improvement, with shared catalog performance approaching that of unshared catalogs.
A method for sharing a catalog of a data set in a multiprocessor system, the multiprocessor system including a plurality of host systems and a plurality of direct access storage device (DASD) subsystems, comprising the steps of:
A system for sharing a catalog of a data set in a multiprocessor system, the multiprocessor system including a plurality of host systems and a plurality of direct access storage device (DASD) subsystems, comprising:
A method for sharing a catalog of a data set in a multiprocessor system, the multiprocessor system including a plurality of host systems and a plurality of direct access storage device (DASD) subsystems, the method comprising the steps of:
A system for sharing a catalog of a data set in a multiprocessor system, the multiprocessor system including a plurality of host systems, the system comprising:
Dependencies are inferred from the claim text.