Storage Stack I/O Merging for Latency Reduction
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Solution Overview
Problem
The existing storage stack systems experience increased latency and inefficiencies due to the separate processing and transmission of data block I/O operations and checksum I/O operations, leading to prolonged round trip times and reduced performance in data integrity validation.
Innovation Solution
The storage stack combines data block I/O operations and checksum I/O operations into a single I/O operation, allowing for efficient routing and processing through the storage stack, and accumulates multiple I/O operations to minimize round trip times by transmitting them in a single combined operation to the underlying storage device layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If data block I/O operations and checksum I/O operations are processed separately, then data integrity validation can be performed, but latency increases and processing efficiency decreases
Solution Approach 1:
The patent combines data block I/O operations and checksum I/O operations into a single unified I/O operation. The storage stack accumulates both data blocks and their corresponding checksums, then transmits them together in one operation to the underlying storage device layer, eliminating the need for separate round trips and reducing latency while maintaining data integrity validation.
2Reliability
If separate I/O operations are used for data blocks and checksums, then data integrity can be validated, but I/O operations per second (IOPS) are reduced
Solution Approach 1:
The storage stack merges multiple I/O operations (data blocks and checksums) into a single combined I/O operation that is transmitted to the underlying storage device layer in one go. This accumulation and combining approach increases the number of I/O operations per second by reducing the overhead of multiple separate operation cycles.
3Loss of information
If multiple separate I/O operations are transmitted to the storage device layer, then data and checksums can be accessed, but round trip time is prolonged
Solution Approach 1:
The storage stack performs preliminary accumulation of data blocks and checksums into a single combined I/O operation before transmission to the underlying storage device layer. This preliminary consolidation eliminates multiple separate round trips, reducing the total time required while ensuring both data and checksums are properly accessed and retrieved.
Data Source
AI summary
Techniques are provided for combining data block and checksum block I/O into a single I/O operation. Many storage systems utilize checksums to verify the integrity of data blocks stored within storage devices managed by a storage stack. However, when a storage system reads a data block from a storage device, a corresponding checksum must also be read to verify integrity of the data in the data block. This results in increased latency because two read operations are being processed through the storage stack and are being executed upon the storage device. To reduce this latency and improve I/O operations per second, a single combined I/O operation corresponding to a contiguous range of blocks including the data block and the checksum block is processed through the storage stack instead of two separate I/O operations. Additionally, I/O operation may be combined into a single request that is executed upon the storage device.