Data record copy system for a disk drive array data storage subs

Details Data record copy system for a disk drive array data storage subs Data record copy system for a disk drive array data storage subs

1992-04-17

1995-04-25

Rudolph, Rebecca L.

Boots, shoes, and leggings

364DIG2, 364952, 3649521, 364961, 395600, G06F 1200

Patent

active

054106672

ABSTRACT:
The disk drive array data storage subsystem maps between virtual and physical data storage devices and schedules the writing of data to these devices. The 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. This system copies data records by simply creating a duplicate data record pointer in a virtual track directory to reference the original data record. This enables the host processor to access the data record via two virtual addresses while only a single physical copy of the data record resides in the data storage subsystem.

REFERENCES:
patent: 5124987 (1992-06-01), Milligan et al.
Patterson, D. A. et al. "Intro to redundant arrays of inexpensive disks (RAID)" COMPCON Spring '89 (IEEE Cat. No. 89CH2686-4) pp. 112-117.

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