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Reorganization and repair of an icf catalog while open and in-use in a digital data storage system

a digital data storage system and catalog technology, applied in the field of digital data storage systems, can solve the problems of serious damage to the internal structure of the bcs catalog, the known methodologies do not meet the requirements for a re-org, and the catalog may be damaged almost certainly

Inactive Publication Date: 2007-04-19
MAINSTAR SOFTWARE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0031] A primary objective of a BCS catalog re-org process is minimizing Catalog Management down-time (i.e., the necessary window of its unavailability) which in turn results in minimum impact on application jobs that require use of the catalog, while still complying with the various constraints and requirements mentioned above.
[0033] One especially important objective of the invention is to enable recovering from a failed re-org attempt without catalog data loss or corruption.

Problems solved by technology

These known methodologies do not satisfy the requirements for a re-org while open, as they inherently require the BCS to be quiesced and closed throughout the re-org process.
If an attempt is made to utilize one of these methodologies for re-org while the BCS catalog is open and active, serious damage will almost certainly occur to the internal structure of the BCS catalog, and any of the jobs (including Catalog Management) may ABEND (abort or end abnormally) with unpredictable results at a subsequent time.
For the BCS, it is very difficult to schedule and perform a re-org.
Most BCS catalogs have 24×7 availability requirements, from at least one of the MVS systems that are sharing access to it, and the “down-time” to re-org the BCS is disruptive to production application processing.
Even if the downtime is planned and scheduled, it represents an outage that might not be acceptable for 24×7 environments.
If it is unplanned and a forced situation, it can result in disastrous business disruption.

Method used

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  • Reorganization and repair of an icf catalog while open and in-use in a digital data storage system
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  • Reorganization and repair of an icf catalog while open and in-use in a digital data storage system

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Embodiment Construction

[0043] Referring now to FIG. 3, the first step 302 of a presently preferred embodiment establishes the ESTAE environment, so that any ABENDs that might occur during processing will be trapped and handled within the logic. Step 304 obtains catalog environment information, validating that the named catalog is appropriate, and establishing the environment in which the process will execute. In a presently preferred embodiment, much of this information will be the result of specifications on the user command that initiates the process. Some options are: [0044] The name of the single BCS catalog to be re-org'ed. The implementation will require that the BCS to be re-orged must be currently connected to the master catalog as a user catalog. It cannot be the master catalog of the MVS operating system on which the process is run, although it can be a master catalog of another system if it is not currently an active master catalog at the time of the process. [0045] The catalog is not required ...

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Abstract

MVS mainframe computer systems employ the ICF (Integrated Catalog Facility) catalog environment to manage numerous data sets. To provide nearly continuous availability of those data sets, the BCS catalog (250,270) must be re-organized while leaving the catalog open to access by applications. To perform a re-org while open, a data CI correlation table (500) can be constructed (314) and used to lay the data CIs into a backup file in logical order (316), so that they can be loaded into the new BCS catalog (324) without sorting, thereby reducing downtime.

Description

RELATED APPLICATIONS [0001] This application is a continuation of and claims priority to co-pending U.S. patent application Ser. No. 10 / 783,835, filed Feb. 20, 2004.COPYRIGHT NOTICE [0002]© 2003-2004 Mainstar Software Corporation. A portion of the disclosure of this patent document contains material which is subject to copyright protection. The copyright owner has no objection to the facsimile reproduction by anyone of the patent document or the patent disclosure, as it appears in the Patent and Trademark Office patent file or records, but otherwise reserves all copyright rights whatsoever. 37 CFR §1.71(d). TECHNICAL FIELD [0003] This invention is in the field of digital data storage systems and, more specifically, pertains to storage systems that employ ICF catalogs for managing and using data sets. BACKGROUND OF THE INVENTION [0004] The IBM MVS® mainframe operating system has evolved into the primary data server for very large enterprise computer system environments. This new and ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): G06F17/30
CPCG06F17/30067Y10S707/99953Y10S707/99955G06F16/10
Inventor PACE, RICHARD G.HASEGAWA, MARTIN K.FERGUSON, RONALD K.
Owner MAINSTAR SOFTWARE CORP
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