Patent ID: 6185697
Filing Date: 2001-02-06
Classification: G06F

Abstract:
A disk-array controller, comprising:data buffers accessible from any of a host device and disk units;exclusive-OR circuits for carrying out exclusive-OR operations;circuits for checking redundant parity, where outputs of the exclusive-OR circuits are determined as true when the outputs are all zero ""0"";selectors for selecting outputs from the host devices or the disk units and outputs from the exclusive-OR circuits and transferring selected outputs to the data buffers;selectors for selecting whether or not to transport outputs from each of the data buffers to the exclusive-OR circuits;selectors for selecting whether or not to transport outputs from the host device or the disk units;selectors for selecting whether or not to transport all one ""1"" to the exclusive-OR circuits to reverse outputs of the exclusive-OR circuit; andtransfer buses for transferring outputs of the exclusive-OR circuits to the host device and the disk units,whereinthe transfer buses are determined by adjusting a selection of the selectors at the time of transmission.