Reducing total seek time for determining an access sequence of data stored on a tape medium

摘要

A first data group in an access sequence is selected. Those data groups located in specified regions of the tape medium are separated from other data groups located in alternative specified regions of the tape medium. The distance from the current position of the tape medium is set to be a logical distance value, determined by a calculation function, that is substituted for the physical distance value for the data groups that are located in the specified regions as compared with other data groups located in the alternative specified regions. A second data group in the access sequence is selected. The logical distance value is then determined by multiplying a coefficient based on a physical positioning of each of the data groups in the tape medium, and a percentage of those of the plurality of data groups that have already been selected as the first data group and the second data group.

主权项

1. A method using a processor device for reducing total seek time for determining an access sequence of a plurality of data groups stored on a tape medium, the method, using the processor device, comprising:
selecting, using the processor device, a first data group in the access sequence wherein:
those of the plurality of data groups that are located in specified regions of the tape medium are separated from those of the plurality of data groups that are located in alternative specified regions of the tape medium, andthe distance from the current position of the tape medium is set to be a logical distance value, determined by a calculation function, that is substituted for an actual physical distance value for the specified regions different from the alternative specified regions; selecting, using the processor device, a second data group in the access sequence; and multiplying, for determining the logical distance value, a coefficient based on a physical positioning of each of the plurality of data groups in the tape medium and a percentage of those of the plurality of data groups that have already been selected as the first data group and the second data group.