z/OS DFSMSdfp Advanced Services
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An EXCP Request with a Single 16K Storage Area

z/OS DFSMSdfp Advanced Services
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In Figure 1, the TCW points to a single 16K area of storage. When EXCP translates the channel program, it creates four TIDAWs, one for each page.
Figure 1. How EXCP translates an EXCP request with a single 16K storage area
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Note that if the TCW points to an area that is less than or equal to 4K but spanned pages, EXCP will create two TIDAWs.

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