HDM Decoder for Byte-Level RAID Access
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Solution Overview
Problem
Current RAID configurations primarily support block-level access, which can lead to data corruption or inaccuracy when bypassing the RAID controller, especially in byte-level access scenarios, particularly in RAID levels 0 and 1 configurations.
Innovation Solution
Implementing a Host-Managed Device Memory (HDM) decoder that exposes a RAID address range and manages byte-level protocol requests across storage devices, ensuring data integrity by directing requests appropriately between primary and secondary storage devices in RAID configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If byte-level access is enabled to storage devices in a RAID configuration, then access speed and flexibility are improved, but data integrity and accuracy deteriorate due to potential bypass of RAID controller
Solution Approach 1:
The patent introduces a decoder as an intermediary component that mediates between the byte-level access requests and the storage devices. The decoder translates byte-level addresses into appropriate storage device addresses while ensuring RAID protocols are respected, thus enabling fast byte-level access without compromising data integrity through bypass of RAID controller.
2Reliability
If hardware RAID implementation is used, then data integrity is improved through parity and striping, but device complexity and cost increase
Solution Approach 1:
The patent enables storage devices to self-manage RAID operations by incorporating a decoder within each storage device that can independently handle byte-level access requests. This self-service capability eliminates the need for complex external hardware RAID controllers, reducing overall system complexity while maintaining data integrity through embedded RAID management functionality.
3Loss of time
If RAID controller is bypassed for direct storage access, then access time is reduced, but data accuracy deteriorates due to lack of RAID protocol enforcement
Solution Approach 1:
The patent implements preliminary action by having the decoder pre-configure and pre-process address translations before data access occurs. The decoder establishes the mapping between byte-level addresses and storage device addresses in advance, ensuring that RAID protocols are enforced automatically during fast byte-level access without requiring post-access verification or controller intervention.
Data Source
AI summary
A system is disclosed. The system may include a processor that may issue a byte level protocol request including a byte address. The system may also include a first storage device and a second storage device. The first storage device and the second storage device may support a cache coherent interconnect protocol, the cache coherent interconnect protocol including a block level protocol and a byte level protocol. The first storage device and the second storage device are included in a redundant array of independent disks (RAID). The first storage device may include a first address range, and the second storage device may include a second address range. The second storage device may provide a RAID address range associated with the first address range and the second address range. A decoder associated with the second storage device may be configured to receive the request from the processor. The decoder may determine that the byte address in the RAID address range is associated with a target address range.