Updating and reading data and parity blocks in a shared disk sys

Details Updating and reading data and parity blocks in a shared disk sys Updating and reading data and parity blocks in a shared disk sys

1998-08-04

2000-10-03

Moise, Emmanuel L.

Error detection/correction and fault detection/recovery

Pulse or data error handling

Digital data error correction

714 6, 714770, 714805, 711114, G11C 2900

Patent

active

061287628

ABSTRACT:
A system and method for updating data. A first processing unit, such as an adaptor, receives a data update to a data block in a first storage device, such as a hard disk drive. Parity data for the data block is maintained in a second storage device, e.g., another hard disk drive. A parity group is comprised of the data block and corresponding parity data. The first processing unit determines whether the first processing unit controls access to the parity group, i.e., the state of lock ownership. The first processing unit transmits the data update to a second processing unit after determining that the first processing unit does not control access to the parity group. The second processing unit, another adaptor, performs an update after receiving the data update from the first processing unit. The first processing unit performs an update after determining that the first processing unit controls access to the parity group.

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