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The following parameters are used to manage the dual mirror image file:
If parameter DUALM is set to Y (Yes) and an error occurs in the dual mirror image file, the current operation fails for the primary file as well. Make any manual corrections before any further processing is done. If parameter DUALM is set to N (No), processing continues for the primary file only, without dual mirror image file support.
An additional dual mirror image option is an internal timestamp checkpoint to ensure that the primary and dual copies are fully synchronized. This ensures greater data integrity but increases I/O processing overhead.
This option is activated if parameter DUALST in the IOA Access Method definition member is set to Y (Yes) during file creation. If the timestamp values are not synchronized between the primary and dual files, the dual file is rebuilt. For additional information, see the IOADBF utility in the INCONTROL for z/OS Utilities Guide.
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