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A (DASD) direct access storage device Factory Map is used to reduce the number of alternate sectors which are read and analyzed during the process of recovering reassigned primary sectors.
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Using the Factory Map to Optimize the DASD Recover Operation
A (DASD) direct access storage device Factory Map is used to reduce the
number of alternate sectors which are read and analyzed during the process of
recovering reassigned primary sectors.
In the figure, for each head on each cylinder on the DASD, a Recover
operation determines if the ID of the alternate sector indicates that a primary
sector has been reassigned to it. If a reassignment condition is discovered, then
the primary sector is a candidate to be recovered back to its original location.
An entry in the Factory Map which is on the same head and cylinder as the
alternate sector whose ID is to be read and analyzed indicates that a pushdown
into the alternate location has occurred. In a pushdown condition, the alternate
location has been replaced with the previous sector. An alternate sector does
not exit for that head and cylinder, and, therefore, the ID at the alternate location
does not have to be read.