International Business Machines Corporation

Mark Edward Thomen

Patricia Driscoll Choi

Stephen Merritt Branch

Sanjay Shyam

Savur Anand Rao

Victor Sheng-Jian Liang

Edward H Daray, Jr

The apparatus for dynamically allocating resources used in a meta-data repository includes a tracking module to track resources allocated to a meta-data repository, the meta-data repository comprising a repository that stores meta-data related to a computer system. An adjustment evaluation module evaluates repository usage of the resources allocated to the meta-data repository and ascertains whether a resource adjustment is desirable. An adjustment determination module determines desirable adjustments to the resources available to the meta-data repository. An allocation module adjusts resources allocated to the meta-data repository in accordance with the adjustment determination module. Adjusting resources includes changing a number of strings allocated to handle concurrent meta-data repository I/O requests.

Dynamically allocating meta-data repository resources

An apparatus, system, and signal bearing medium are disclosed for dynamically allocating meta-data repository resources. In one embodiment, the present invention includes tracking resources allocated to a meta-data repository, evaluating repository usage of the resources allocated to a meta-data repository to ascertain whether a resource adjustment is desirable, determining the desirable adjustments to the resources allocated to a meta-data repository, and adjusting the allocated resources in accordance with the determined amount. In one embodiment dynamically allocating meta-data repository resources, strings and buffers from volatile memory, will efficiently use necessary resources thereby not misusing essential system memory. By dynamically allocating meta-data repository resources, system and work performance are enhanced increasing productivity.

Apparatus, system, and method for dynamically allocating and adjusting meta-data repository resources for handling concurrent I/O requests to a meta-data repository

An apparatus and method are disclosed for passing data between catalogs in a computer operating system. The apparatus includes an identifying module, a receiving module, a definition module, and an updating module. The identifying module identifies a first catalog having at least one data set to be passed to a second catalog. The receiving module receives the information from the first catalog. The information includes the location of data-specific information. The definition module utilizes the information received from the first catalog to define the second catalog. The updating module utilizes the location of the data-specific information received from the first catalog to update the information to reflect the name of the second catalog.

Apparatus and method for passing information between catalogs in a computer operating system

A dynamic construct is associated with one or more operational parameters of one or more components of a storage management system, wherein a pointer to the construct is retained in metadata for the storage management system, the values of the construct are stored in a first repository separate from a second repository normally used to store the metadata for the storage management system. The value of the construct in the first repository is allowed to change dynamically at any point of time without affecting the metadata in the second repository. Thereafter, the value of the construct in the first repository is retrieved and used as the operational parameter, instead of a static value in the metadata in the second repository. This provides a level of indirection that allows the construct to be applied dynamically in the storage management system.

Method for specifying a dynamic construct in a storage management system

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.

Growing community of inventors

Morgan Hill, CA, United States of America

Mark Edward Thomen