Importance

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Abstract

Copies of data that are stored on tracks of a primary disk volume and a backup disk volume are synchronized by a method which reduces the amount of data that is transferred. The primary disk volume includes tracks with current data (i.e., non-empty tracks) and tracks with no current data (i.e., empty tracks). The method transfers to the backup disk volume only data from non-empty tracks on the primary disk volume and then writes the data onto tracks in the backup disk volume that correspond to the non-empty tracks of the primary disk volume. Prior to writing of the data onto the backup disk volume, it is preferred that the backup disk volume have all tracks erased so that after the write action, only the tracks with current data have data written therein. Further, at the primary disk volume, only tracks having current data are read. Accordingly, substantial savings in processing and data transfer times are achieved.

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First Claim