LRAID Memory Access with Fast-Path Error Recovery

The patent segments the error detection and correction process into two distinct phases: a fast path for error-free operations that uses minimal interface bandwidth, and a slow path for error recovery that activates only when needed. This segmentation allows the system to maintain high interface utilization efficiency during normal operation while preserving comprehensive error detection and correction capabilities.

The patent implements preliminary action by pre-calculating and storing syndrome values along with data in the memory devices. When a read operation occurs, the system can immediately verify data integrity using these pre-computed syndromes without requiring additional interface transactions for error detection, thus maintaining high interface efficiency while ensuring reliable error detection.

The patent applies partial action by performing error checking selectively rather than on all data accesses. The fast path implements minimal or no error checking for the majority of error-free operations, while the slow path performs comprehensive error checking only when errors are detected or suspected. This selective approach maintains high access speed for normal operations while ensuring data integrity when needed.

The patent changes the parameter of error checking intensity based on operational context. During normal fast path operations, error checking is minimized or eliminated to maintain high speed. When transitioning to the slow path for error recovery, the error checking parameter is increased to comprehensive levels, ensuring data integrity without permanently sacrificing access speed.

The patent implements preliminary action by pre-storing syndrome values and error correction information in the memory devices alongside the data. When errors occur, the system can immediately initiate recovery using these pre-computed values without requiring time-consuming recalculation or additional data accesses, thus improving system availability while minimizing repair time.

The patent enables the system to skip the lengthy error recovery process for the majority of operations by implementing a fast path that assumes error-free conditions. This allows normal operations to proceed rapidly without error checking overhead. When errors do occur, the system transitions to the slow path for recovery, but the overall time loss is minimized because errors are rare and most operations complete quickly through the fast path.