Data storage library with media destaging and prestaging for improved response time
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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Feb 22, 2000
Grant Date -
N/A
app pub date -
Oct 22, 1996
filing date -
Oct 22, 1996
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method for improving the response time of a data storage library of removable media is disclosed. The library includes a media storage rack with multiple slots for storing data media, a storage drive for writing data to or reading data from one of the media, a picker for moving the media between the slots and the drive, and a destage slot physically close to the drive. The method comprises the steps of: moving a first medium from the drive to the destage slot, the first medium being one that was last accessed by the drive; moving a second medium from a slot holding the second medium to the drive, the second medium being the medium that will be accessed next by the drive; during the operation of the drive on the second medium, returning the first medium from the destage slot to the slot originally holding the first medium; and positioning the picker close to the drive. In another embodiment of the invention, the library additionally includes a prestage slot. The step of returning the first medium, while the drive is accessing the second medium, includes the step of moving a third medium from the storage rack to the prestage slot. The third medium being one that will be accessed by the drive, following the second medium.
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