Electrical computers and digital processing systems: memory – Storage accessing and control – Specific memory composition
Patent
1997-02-28
2000-08-22
Cabeca, John W.
Electrical computers and digital processing systems: memory
Storage accessing and control
Specific memory composition
711100, 711111, 711114, 711162, 711163, 711165, G06F 1200
Patent
active
061087483
ABSTRACT:
A system and method for providing on-line, real-time, transparent data migration from an existing storage device to a replacement storage device. The existing and replacement storage devices are connected as a composite storage device that is coupled to a host, network or other data processing system. The replacement storage device includes a table which identifies data elements that have migrated to the replacement storage device. When a host system makes a data transfer request for one or more data elements, the replacement storage device determines whether the data elements have been migrated. If the data elements have migrated, the replacement storage device responds to the data transfer request independently of any interaction with the existing storage device. If the data elements have not migrated, the replacement storage device migrates the requested data elements and then responds to the data request and updates the data element map or table. When not busy servicing other requests, the replacement storage device operates in a background mode to migrate data elements so the data migration can occur concurrently with and transparently to system operations.
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Ofek Yuval
Yanai Moshe
Bataille Pierre-Michel
Cabeca John W.
EMC Corporation
Herbster George A.
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