Address Window Controller for RAID Data Recovery
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Solution Overview
Problem
Traditional RAID systems face challenges in data recovery time and resource utilization when multiple data storage devices become unavailable, particularly due to the need for reconfiguration of the RAID command stack and limitations in handling devices of varying sizes, leading to delays and inefficiencies in resuming array operation.
Innovation Solution
The implementation of a data storage array controller with an address window controller that blocks or substitutes pseudo data for unavailable address ranges, allowing for transparent management of data access and manipulation without reconfiguring the command stack, enabling efficient data recovery and operation across devices of different sizes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional RAID systems reconfigure the command stack when data storage devices become unavailable, then data recovery can be performed, but data recovery time increases and system productivity decreases
Solution Approach 1:
The system pre-loads pseudo data into buffer memory before actual data recovery is needed. When a storage device becomes unavailable, the pseudo data is already prepared and can be immediately used in place of the missing data, eliminating the time-consuming reconfiguration process that would normally be required to perform data recovery operations.
2Adaptability or versatility
If the RAID command stack is reconfigured when devices become unavailable, then data access can be redirected, but system complexity and resource consumption increase
Solution Approach 1:
The invention introduces an address window controller as an intermediary component between the RAID command stack and the data storage devices. This controller intercepts address requests and redirects them to appropriate locations in buffer memory where pseudo data has been pre-loaded, thereby providing data access flexibility without requiring complex reconfiguration of the command stack itself.
3Reliability
If data is recovered and re-written to remaining devices, then array operation can resume, but processing resources are consumed and operation delay occurs
Solution Approach 1:
Instead of performing the resource-intensive operation of recovering data and re-writing it to remaining storage devices, the system creates copies of the necessary data in the form of pseudo data and loads them into buffer memory. This allows the array to immediately resume operations using the buffered copies, avoiding the time-consuming and resource-consuming data re-write process while maintaining operational continuity.
Data Source
AI summary
An integrated circuit device comprises a data storage array controller for providing data storage array functionality for at least one data storage array. The data storage array controller comprises an address window controller arranged to receive at least one data storage device access command, and upon receipt of the at least one data storage device access command the address window controller is arranged to compare a target address of the at least one data storage device access command to an address window for a target storage device of the at least one data storage device access command, and if the target address is outside of the address window for the target storage device, block the at least one data storage device access command.