Optimizing the execution sequence in a tape apparatus in order to minimize tape traveling distance
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United States of America Patent
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Jul 13, 2004
Grant Date -
N/A
app pub date -
Jun 29, 1999
filing date -
Aug 3, 1998
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A tape apparatus increases throughput of data access requests by rearranging the sequence in which data access requests are processed in order to reduce repositioning of a tape medium. The tape apparatus includes a command queue for storing a plurality of instructions from a host apparatus, and a reordering mechanism for analyzing the stored instructions according to a predetermined set of rules. The sequence of the stored instructions are rearranged in order to minimize driving of the tape medium. The reordering mechanism can select N commands at a time from the head of the command queue, and determine a sequence for executing the N commands, yielding a minimum total driving distance of a medium tape from a current position of the tape medium.
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