Mapping locations of logical volume records on a physical stacked volume
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United States of America Patent
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Nov 25, 2014
Issued Date -
N/A
app pub date -
May 30, 2012
filing date -
May 6, 2010
priority date (Note) -
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status (Latency Note)
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Abstract
In one embodiment, a method for accessing host data records stored in a virtual tape storage (VTS) system includes receiving a mount request to access a host data record, determining a starting logical block ID (SLBID) corresponding to the requested host data record, determining a physical block ID (PBID) that corresponds to the SLBID, accessing a physical block on a tape medium corresponding to the PBID, and outputting the physical block corresponding to the PBID without outputting an entire logical volume that the physical block is stored to. According to another embodiment, a VTS system includes random access storage, sequential access storage, support for a virtual volume, a storage manager having logic for determining a PBID that corresponds to a SLBID, and logic for copying a portion of a logical volume from the sequential access storage to the random access storage without copying the entire logical volume.
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