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Resynchronization of mirrored direct access storage devices (DASD) is performed by a common DASD controller.
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Data Integrity During Mirror Synchronization
Resynchronization of mirrored direct access storage devices (DASD) is
performed by a common DASD controller.
Resynchronization of the mirror means that the appropriate portion of a
"good" DASD is read and the corresponding portion of the "bad" DASD is written.
In other words, the good mirror is copied to the bad mirror. This operation in
combination with normal processing of the data can cause data integrity
A small "hold" area contains extents of the current copy I/O operation. When
normal output operation occurs and synchronization is active: if no portion of the
output operation overlaps "hold" extents, the operation continues; otherwise, the
current copy operation is restarted and a read FIFO is scheduled behind the
"good" DASD output, as indicated in the Figure.