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Method to protect shared physical sequential DASD data sets from data integrity problems by preventing concurrent output access within a GRSplex.

IP.com Disclosure Number: IPCOM000021002D
Original Publication Date: 2003-Dec-16
Included in the Prior Art Database: 2003-Dec-16
Document File: 2 page(s) / 46K

Publishing Venue

IBM

Abstract

A method to provide multi-tiered levels of support for concurrent output access to a shared Physical Sequential DASD dataset based on the customer's data integrity requirements. The customer has the option of requesting no additional data integrity protection over what is currently available, requesting a warning message to be issued in the case of a concurrent output access violation, requesting to fail the attempt to concurrently access the shared dataset for output, or to selectively bypass this protection based on either the dataset name or by an authorized application requesting this protection be bypassed.

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SJO820030045 Abdy Raissinia/San Jose/IBM Jon Lynds, Manuel Valdivia, Jerry Codde, Savur Rao

Method to protect shared physical sequential DASD data sets from data integrity problems by preventing concurrent output access within a GRSplex .

A method is disclosed that allows customers to protect shared Physical Sequential(PS)

DASD datasets from concurrent output access within a GRSplex based on the level of data integrity required. Instead of failing each possible integrity violation, the installation is allowed to define a data integrity tier level of protection. The tier level is defined in new PARMLIB member IFGPSEDI. The data integrity tiers are defined as follows:

Tier 0 - Current This level allows the installation to process without any Enhanced Data Integrity(EDI) protection. In other words, this level processes as it does today. This provides no means to protect against concurrent shared output access for a PS DASD data set. The installation can request this either by not creating new PARMLIB member IFGPSEDI or by specifying disable mode in IFGPSEDI.

Tier 1 - Warning Applications can continue to maintain their current level of data integrity for PS DASD data sets when they are concurrently accessed shared for output processing. However, the installation can monitor and audit concurrent shared access by activiating EDI in warning mode. This results in creating a System Management Facilities(SMF) record audit trail, as well as new system messages that identify a possible violation of EDI protocols has occurred and the j...