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Configuring z/OS to Ensure Successful DASD Swap Using the CRITICALPAGING Function



Document Author:
Additional Author(s):

Riaz Ahmad
Nicole M Fagen, David H Surman, Elpida Tzortzatos


Document ID:

WP101800


Doc. Organization:

Advanced Technical Sales


Document Revised:

12/05/2010


Product(s) covered:

z/OS







Abstract: Many customers use a DASD Swap technology to maximize availability. Typically, one set of DASD is referred to as the primary DASD and the other set referred to as the secondary. If maintenance is required on the primary, a swap to the secondary may be manually initiated. Another benefit of having secondary DASD is the system may swap to the secondary if there is a failure on the primary DASD. The swap technology may not be able to achieve its goal, or a system outage may occur, if a code path critical to the DASD Swap or system function takes a page fault while a DASD Swap is taking place. IBM strongly recommends the CRITICALPAGING function be enabled to strengthen DASD Swap processing. The IBM DASD Swap technologies are Basic HyperSwap and GDPS HypserSwap Manager. Other DASD Swap technologies may also be configured to benefit from the CRITICALPAGING function.

DASD Swap CRITICALPAGING.pdf DASD Swap CRITICALPAGING.pdf



Classification:

Hardware; Software

Category:

Planning and Design




Platform(s):

IBM System z Family; IBM Storage



O/S:

MVS; z/OS

Keywords:

DASD Swap, HyperSwap, CRITICALPAGING, Basic HyperSwap and GDPS HypserSwap Manager, DASD Swap, HyperSwap, CRITICALPAGING, Basic HyperSwap and GDPS HypserSwap Manager, DASD Swap, HyperSwap, CRITICALPAGING, Basic HyperSwap and GDPS HypserSwap Manager

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