Method and apparatus for improving sequential writes to RAID-6 d

Details Method and apparatus for improving sequential writes to RAID-6 d Method and apparatus for improving sequential writes to RAID-6 d

1998-04-08

2000-08-08

Beausoliel, Jr., Robert W.

Error detection/correction and fault detection/recovery

Data processing system error or fault handling

Reliability and availability

714 6, 714770, 711114, G06F 1100

Patent

active

061016152

ABSTRACT:
A method is provided for reducing the number of transactions for multi-segmented host system write operations in a RAID 6 device. The method comprises sending a write command for new multiple data segments to a plurality of data drives in the RAID 6 device via a RAID 6 controller. The RAID 6 device has data segments stored in stripes on the data drives and parity drives within the RAID 6 device. Parity is calculated for old data segments, new data segments and old parity on the parity drives to determine a new parity. The new parity is then written to one parity drive of the multiple parity drives within the RAID 6 device, thereby reducing the number of read and write transactions between the controller and the drives within the RAID 6 device.

REFERENCES:
patent: 5499253 (1996-03-01), Lary
Chen et al. RAID;: High Performance, Reiable Secondary Storage, ACM Computing Surveys vol. 26 No. 2, Jun. 1994, entire document.

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