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Restartable Online DEDB Area Expansion Tool

IP.com Disclosure Number: IPCOM000015365D
Original Publication Date: 2002-Jul-30
Included in the Prior Art Database: 2003-Jun-20
Document File: 2 page(s) / 41K

Publishing Venue

IBM

Abstract

The Online Area Extender tool (OAE) was designed with the ability to restart in mind. The tool was designed to perform the DEDB area expansion in seperate steps, allowing a restart of the tool to complete the requested area expansion. The alternative would be to remove a the DEDB area from online availability to perform a recovery of the DEDB area. For interested customers this is unacceptable as they need data availablility on a 7x24 bases. Currently, there is a need to allow online expansion of either the IOVF and/or SDEP portions of a DEDB area. The difficulty in following this has been allowing the expansion of the IOVF portion of the DEDB area if the area is defined with SDEPs, while still allowing concurrent online SDEP activity, and still allow for the utility to be restarted in case of a non-catastrophic error. In the above diagram: RAA : Root Addressable Area within the DEDB area

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Restartable Online DEDB Area Expansion Tool

   The Online Area Extender tool (OAE) was designed with the ability to restart in mind. The tool was designed to perform the DEDB area expansion in seperate steps, allowing a restart of the tool to complete the requested area expansion. The alternative would be to remove a the DEDB area from online availability to perform a recovery of the DEDB area. For interested customers this is unacceptable as they need data availablility on a 7x24 bases.

Currently, there is a need to allow online expansion of either the IOVF and/or SDEP portions of a DEDB area. The difficulty in following this has been allowing the expansion of the IOVF portion of the DEDB area if the area is defined with SDEPs, while still allowing concurrent online SDEP activity, and still allow for the utility to be restarted in case of a non-catastrophic error.

In the above diagram:

RAA : Root Addressable Area within the DEDB area

IOVF : Independent OVerFlow portion of the DEDB area
SDEP : Sequential Dependent Segment portion of the DEDB area
UOW : Unit Of Work
Base Section (RAP) : the RAP portion of a UOW
RAP : Root Anchor Point
DOVF : Dependent OVerFlow portion of the UOW
Total CI's per UOW : the combination of RAP and DOVF
RUOW : the Reorganization UOW, no longer used.

     With online activity against the SDEP portion of the area, it appears to preclude an online extension of the IOVF portion of the AREA due to the SDEP portion of the DEDB area physically residing after the IOVF portion of the DEDB area and still allow for utility restart. The invention is a method to allow a DEDB area to be expanded, with concurrent online access of the SDEP portion of the DEDB area and still allow for utility restart. To accomplish this, the DEDB area is extended in seperate, unique, phases.

     Phase I is to extend the SDEP portion of the DEDB area. Simply format the new CIs as SDEPs, and update the area structure information to reflect the new, larger SDEP portion of the DEDB area. While the CIs are being formatted as SDEP CIs, no online activity can exist against this portion of the DEDB area, so no contention will exist. This step remains the same, regardless of whether the IOVF or the SDEP portion of the DEDB area are being extended. This will allow growth in the number of SDEP segments which reside in the DEDB area while phase II and phase III are executed (phase I and phase II only executed for online extension of the IOVF portion of the DEDB area).

     Phase II determines how many CIs the IOVF portion of the DEDB area is to be expanded by, and cannibalizes (steals) that number of SDEP CIs from the SDEP portion of the DEDB area. We require the cust...