Zoned SSD RAID Parity Layout for Higher Capacity Protection
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Solution Overview
Problem
Conventional RAID systems require two dedicated storage drives for parity data, which reduces storage capacity and increases cost, especially in high-capacity SSD environments.
Innovation Solution
Implementing a RAID system using zoned namespace solid-state drives (ZNS SSDs) that store parity data within a single parity drive and distribute it across data drives, eliminating the need for additional parity drives.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If two dedicated storage drives are allocated for parity data in conventional RAID systems, then dual parity protection is achieved, but storage capacity and cost efficiency deteriorate
Solution Approach 1:
The patent merges the functions of data storage and parity storage into the same physical SSD drive by utilizing different namespaces (data namespace and parity namespace). This eliminates the need for separate dedicated parity drives while maintaining dual parity protection, thereby improving storage capacity utilization without compromising reliability.
Solution Approach 2:
The same physical SSD drive performs multiple functions: storing both data and parity information. By implementing a unified RAID controller that manages both data namespace and parity namespace on the same drive, the system achieves multi-functionality, allowing a single drive to serve dual purposes and reduce the total number of drives required.
2Reliability
If two dedicated storage drives are allocated for parity data, then dual parity protection is achieved, but system cost increases
Solution Approach 1:
The patent merges the functions of data storage and parity storage into the same physical SSD drive by utilizing different namespaces (data namespace and parity namespace). This eliminates the need for separate dedicated parity drives while maintaining dual parity protection, thereby improving storage capacity utilization without compromising reliability.
Solution Approach 2:
The same physical SSD drive performs multiple functions: storing both data and parity information. By implementing a unified RAID controller that manages both data namespace and parity namespace on the same drive, the system achieves multi-functionality, allowing a single drive to serve dual purposes and reduce the total number of drives required.
3Quantity of substance
If parity data is distributed across data drives instead of using dedicated parity drives, then storage capacity is improved, but data retrieval complexity increases
Solution Approach 1:
The patent introduces a unified RAID controller as an intermediary that manages both data namespace and parity namespace on the same drive. This controller handles the complexity of distributed parity management, performing XOR operations to reconstruct data when needed. By centralizing the management logic in the controller rather than requiring complex coordination between multiple drives, the system achieves efficient data retrieval despite distributed parity storage.
Data Source
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AI summary
Methods and systems for a storage environment are provided. One method includes splitting storage of a plurality of zoned solid-state drives (ZNS SSDs) into a plurality of physical zones (PZones) across a plurality of independent media units of each ZNS SSD, the PZones visible to a first tier RAID (redundant array of independent disks) layer; generating a plurality of RAID zones (RZones), each RZone having a plurality of PZones; presenting one or more RZones to a second tier RAID layer by the first tier RAID layer for processing read and write requests using the plurality of ZNS SSDs; and utilizing, by the first tier RAID layer, a parity PZone at each ZNS SSD for storing parity information corresponding to data written in one or more PZone corresponding to a RZone presented to the second tier RAID layer and storing the parity information in a single parity ZNS SSD.