Direct access storage device with independently stored parity

Details Direct access storage device with independently stored parity Direct access storage device with independently stored parity

G - Physics

06

F

G06F 7/22 (2006.01) G06F 3/06 (2006.01) G06F 11/10 (2006.01) G06F 11/16 (2006.01) G06F 12/04 (2006.01) G11B 19/28 (2006.01) G11B 20/12 (2006.01) G11C 7/00 (2006.01) G11C 29/00 (2006.01) H03M 13/27 (2006.01)

Patent

CA 2070820

2070820 9109364 PCTABS00005 A failure independent, fault tolerant Direct Access Storage Device (DASD) storage subsystem including a Disk Control Unit (106) and a number of Physical Devices (211, 212) is provided with a parity Generator (303) for generating a parity for system records as the system records are transferred between the storage subsystem and a CPU (101) of a data processing system. The parity is stored on a different unit so that if one unit containing portions of a system record becomes unavailable, the unavailable portion of the record is reconstructed during transfer to the CPU from the remainder of the record and the parity. The storage system of the invention can accommodate variable length data records without requiring operating system modifications.

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