Disk array controller for reading/writing striped data using a s

Details Disk array controller for reading/writing striped data using a s Disk array controller for reading/writing striped data using a s

1996-05-03

2000-01-25

De Cady, Albert

Electrical computers and digital data processing systems: input/

Input/output data processing

Input/output process timing

710 52, 710 74, 711114, 714 6, G06F 1300

Patent

active

060187786

ABSTRACT:
A disk drive array controller and method carries out disk drive data transfers not only concurrently but also synchronously with respect to all of the drives in the array. For synchronous operation, only a single-channel DMA is required to manage the buffer memory. A single, common strobe is coupled to all of the drives for synchronous read and write operations, thereby reducing controller complexity and pin count. A ring-structure drive data bus together with double suffering techniques allows use of a single, common shift clock instead of a series of staggered strobes a required in prior art for multiplexing/demultiplexing buffer memory data, again providing for reduced controller complexity and pin count in a preferred integrated circuit embodiment of the new disk array controller. Methods and circuitry also are disclosed for generating and storing redundant data (e.g. "check" or parity date) "on the fly" during a write operation to a RAID array. Techniques also are disclosed for reconstructing and inserting missing data into a read data stream "on the fly" so that a disk drive failure is transparent to the host.

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D. Patterson, et al. "A Case for Redundant Arrays of Inexpensive Disks (RAID)" (Univ. Cal. Report No. UCB/CSD87/391, Dec. 1987).

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