Multilevel, hierarchical, dynamically mapped data storage subsystem
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United States of America Patent
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Oct 13, 1992
Grant Date -
N/A
app pub date -
Nov 19, 1990
filing date -
Nov 19, 1990
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The disk drive array data storage subsystem functions as a conventional large form factor disk drive memory, using an array of redundancy groups, each containing N+M disk drives. The data storage subsystem does not modify data stored in a redundancy group but simply writes the modified data as a new record in available memory space on another redundancy group. The original data is flagged as obsolete. Virtual tracks that are least used are migrated as part of a free space collection process to low access cylinders, which are, in turn, migrated to secondary media, such as magnetic tape. The migration process is either periodic or demand driven to automatically archive little used data records.
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