Allocation Area Protection Groups Across RAID and Shelf Failures

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Solution Overview

Problem

Conventional RAID systems are inadequate in protecting against entire RAID array failures or storage shelf failures, leading to potential data loss and inefficiencies due to maximum effective size limitations and vulnerability to physical-world issues.

Innovation Solution

The implementation of allocation area protection groups, which dynamically select allocation areas from different RAID arrays and storage shelves to form a unit of protection, ensuring data redundancy across multiple instances to withstand entire RAID array or storage shelf failures.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional RAID arrays are used for data protection, then data redundancy is provided within the same RAID array, but the system is vulnerable to entire RAID array failures or storage shelf failures

Engineering Contradiction:

Improvedata protection capabilityVSAvoidvulnerability to physical-world issues

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The invention segments the protection scope from the RAID array level to the allocation area level. By creating protection groups that span multiple RAID arrays and storage shelves, the system divides the protection domain into smaller, independent units that can survive individual array or shelf failures. This segmentation allows data to be protected across physical boundaries that would otherwise create single points of failure.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The invention adds a new dimension to data protection by organizing allocation areas into protection groups that extend across multiple RAID arrays and storage shelves. Instead of protecting data only within a single RAID array (one dimension), the system creates a multi-dimensional protection structure where allocation areas from different physical locations are grouped together, providing redundancy across spatial dimensions.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Reliability

If allocation area protection groups are implemented, then enhanced protection against RAID array and storage shelf failures is achieved, but system complexity increases due to dynamic selection and management of allocation areas

Engineering Contradiction:

Improveprotection against entire RAID array failureVSAvoidcomplexity of dynamically selecting and managing allocation areas

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The system implements self-service through automated monitoring and dynamic reconfiguration. When failures are detected, the system automatically identifies suitable allocation areas from different RAID arrays and storage shelves to form or update protection groups, without requiring manual intervention. This automation reduces the operational complexity despite the increased structural complexity of multi-array protection.

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The system dynamically changes parameters such as the composition of protection groups and the selection of allocation areas based on current system state. By adjusting these parameters automatically in response to failures or maintenance needs, the system manages complexity through adaptive parameter optimization rather than fixed complex structures.

Inventive Principle:

Principle #35Parameter changes

3Reliability

If data is protected across multiple RAID arrays and storage shelves, then vulnerability to physical failures is reduced, but storage efficiency decreases due to redundant data distribution

Engineering Contradiction:

Improveresilience to storage shelf failureVSAvoidstorage efficiency

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The invention applies local quality by providing enhanced protection only to specific allocation areas that are designated for protection groups, rather than uniformly protecting all data. This allows the system to optimize storage efficiency for non-critical data while providing robust multi-array protection for critical allocation areas, creating different protection qualities in different locations based on data importance.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The system implements partial protection by selectively applying allocation area protection groups only to certain data sets that require enhanced protection. This partial action approach allows the organization to balance reliability needs against storage efficiency costs, applying the more resource-intensive protection mechanism only where necessary rather than universally.

Inventive Principle:

Principle #16Partial or excessive action

Data Source

PatentUS20250370640A1Allocation area protection groups

Publication Date: 2025.12.04 NETAPP INC

AI summary

Techniques are provided for dynamically generating allocation area protection groups for select data sets. A storage environment may include multiple Redundant Array of Independent Disks (RAID) protection groups. A RAID array protects a certain number of storage devices within the RAID array. To provide additional data protection, certain data sets (e.g., files, directories, or other granularity of data or metadata) may be selectively protected utilizing allocation area protection groups. The allocation area protection groups provide additional data loss protection beyond RAID arrays. An allocation area protection group is dynamically constructed for a data set such that the data set is protected for a failure of a RAID array and/or storage shelf.