Parallel NDMP Tape Restore Using Reader-Parser-Writers
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Solution Overview
Problem
Conventional Network Data Management Protocol (NDMP) restore technologies restore data from tape drives in a serial manner, leading to inefficient data recovery and performance issues during file system restoration.
Innovation Solution
A parallel restore system utilizing a reader, parser component, and multiple writers to read data from a tape drive, sort it in memory buffers, and independently recover multiple files to the file system, leveraging system memory and parallel processing to improve restore performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If data is restored from tape drive in a serial manner (one file at a time), then the restore process is simple to implement, but the recovery time is excessive and system performance is degraded
Solution Approach 1:
The patent divides the restore operation into independent parallel tasks by separating file header parsing from data restoration. Multiple files are identified and restored simultaneously through separate processing threads, transforming a single serial operation into multiple parallel operations that can execute concurrently, thereby dramatically improving data recovery speed
Solution Approach 2:
The patent introduces a new dimension of parallel processing by utilizing multiple CPU cores and threads. The restore system operates in parallel across multiple processing dimensions rather than sequentially in a single thread, allowing simultaneous restoration of multiple files from the tape drive through coordinated parallel tasks
2Loss of time
If multiple files are restored simultaneously using parallel processing, then recovery time is reduced and productivity is improved, but system memory requirements and processing complexity increase
Solution Approach 1:
The patent performs preliminary file header parsing and file identification before the actual data restoration begins. By pre-processing the tape data to identify file boundaries and metadata, the system prepares work items in advance that can be efficiently distributed to parallel restoration threads, reducing the memory burden during active restoration
Solution Approach 2:
The patent introduces an intermediary buffer and work item queue system that mediates between the serial tape drive reading and parallel file restoration. This intermediary layer manages data flow and memory allocation, allowing parallel processing while controlling peak memory usage through buffered operations rather than loading all files into memory simultaneously
Data Source
AI summary
Performing parallel file restoration from a serialized storage device using a network data management protocol is presented herein. A system can comprise a reader, a parser component, and a set of writers. The reader can be configured to copy data from a tape drive to memory buffers as buffered data. The parser component can be configured to determine, within the buffered data, a location of a file header record representing a file that has been stored in the tape drive, and generate, based on the file header record, a header work item for facilitating restoration of the file in a file system. Further, the set of writers can be configured to create, based on the header work item using the buffered data, the file in the file system.