Nested Log Structured Array Metadata Management
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional log-structured data storage systems face challenges in taking backups of snapshot extents that contain multiple snapshots, scalability issues due to large metadata storage requirements, performance problems with snapshot operations over large address spaces, and inefficiencies in metadata writes, which limit their usability and scalability.
Innovation Solution
The implementation of an iterative log-structured array (LSA) system that nests metadata storage areas within each other, allowing for dynamic allocation of metadata storage, compression, and data deduplication, along with efficient snapshot management and write caching to improve backup efficiency, scalability, and metadata write performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional LSA stores metadata in separate non-volatile storage, then metadata is preserved across power outages, but physical storage space is consumed and scalability is limited
Solution Approach 1:
The patent implements nested LSA structures where metadata LSAs are contained within data LSAs. This allows metadata to be stored within the same physical storage space as data, eliminating the need for separate metadata storage areas and enabling the system to scale without requiring additional physical storage for metadata.
Solution Approach 2:
The patent combines metadata storage and data storage into a unified log-structured array system. By merging these previously separate functions into a single structure, the system eliminates the overhead of separate metadata storage while maintaining reliability through the log-structured design that preserves data across power outages.
2Adaptability or versatility
If conventional LSA makes snapshot copies of extents, then data accessibility is improved and storage efficiency is enhanced, but backup operations become complex and snapshot information is lost during restoration
Solution Approach 1:
The patent nests metadata LSAs within data LSAs, creating a hierarchical structure where snapshot information is preserved within the nested metadata. This allows backup operations to capture both data and snapshot metadata in a unified structure, simplifying restoration while maintaining data accessibility and snapshot functionality.
3Reliability
If conventional LSA allocates fixed physical storage for maximum configuration, then system reliability is improved, but storage efficiency decreases and scalability is limited
Solution Approach 1:
The patent implements dynamic allocation of physical storage resources based on actual usage. The nested LSA structure allows the system to allocate storage space as needed rather than pre-allocating for maximum capacity, improving storage efficiency while maintaining system reliability through the log-structured design that ensures data integrity.
Solution Approach 2:
By nesting metadata LSAs within data LSAs, the system achieves dynamic scaling where metadata storage grows with data storage. This eliminates the need to pre-allocate fixed storage for metadata and allows the system to scale efficiently from small to large configurations without wasting storage resources.
4Reliability
If conventional LSA performs metadata writes to non-volatile storage, then data consistency is maintained, but write performance deteriorates due to frequent I/O operations
Solution Approach 1:
The patent merges metadata writes with data writes in the unified log-structured array. By combining these previously separate I/O operations into a single write path, the system maintains data consistency while improving write performance, as metadata and data are written together in the same log structure rather than requiring separate I/O operations.
Data Source
AI summary
Provided are an apparatus and method for managing data storage. A first log structured array stores data in a storage device. A second log structured array in the storage device stores metadata for the data in the first log structured array, wherein the second log structured array storing the metadata for the first log structured data storage system is nested within the first log structured array, and wherein the first and second log structured arrays comprise separate instances of log structured arrays. Address space is allocated in the second log structured array for metadata when the allocation of address space is required for metadata for data stored in the first log structured array.