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Primary checkpoint on a coupling facility structure; secondary checkpoint on DASD z/OS JES2 Initialization and Tuning Guide SA32-0991-00 |
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Placing the primary checkpoint on a coupling facility structure provides more equitable access for all members of a MAS than that available through DASD because access occurs using coupling facility lock serialization. To ensure the security of that data through the DUPLEX copy retained on DASD, IBM® suggests this placement for MAS configurations with four or more members. |
Copyright IBM Corporation 1990, 2014
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