Copy Destination Space Blocking for Atomic Multi-Range Copies
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Solution Overview
Problem
Storage devices face challenges in determining and blocking the appropriate amount of destination space for copy operations, especially when multiple source address ranges are involved, which can lead to invalid results due to overlapping commands and lack of atomicity.
Innovation Solution
The method involves determining the amount of destination space by combining indications of source data and blocking it accordingly, using read and write operations to ensure atomicity, and releasing the block when the operation is complete.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the device determines and blocks destination space for copy operations involving multiple source address ranges, then data integrity and atomicity are improved, but device complexity and processing overhead increase
Solution Approach 1:
The device performs preliminary actions by determining the total destination space requirement before executing the copy operation, and blocks the destination space in advance. This ensures that the entire destination range is reserved and protected from overlapping commands before any data transfer begins, guaranteeing atomicity without requiring complex monitoring during the operation.
Solution Approach 2:
The copy operation is segmented into distinct phases: determining destination space based on multiple source address ranges, blocking the calculated destination space, executing the copy operation, and finally releasing the block. This segmentation simplifies the overall process by breaking down the complex atomicity requirement into manageable sequential steps.
2Reliability
If the device blocks destination space to prevent overlapping commands, then command ordering and atomicity are maintained, but processing speed and productivity decrease
Solution Approach 1:
The destination space blocking is performed as a preliminary action before the copy operation begins. By determining and blocking the entire destination space upfront based on the sum of all source address range sizes, the device establishes command ordering guarantees without requiring continuous blocking during the operation, allowing the actual copy to proceed efficiently.
Solution Approach 2:
The device automatically determines the destination space requirement by calculating the total size from the multiple source address ranges provided in the copy command, and self-manages the blocking and releasing of this space. This self-service approach eliminates the need for external coordination or complex inter-locking mechanisms, maintaining productivity while ensuring atomicity.
3Productivity
If the device releases the block after completing the copy operation, then resource utilization is improved, but the risk of incomplete operations increases
Solution Approach 1:
The device uses feedback from the copy operation completion status to control the releasing of the destination space block. The block is released only after confirming that the copy operation has fully completed, ensuring that the operation is atomic and complete before resources are made available again. This feedback mechanism prevents premature resource release that could lead to incomplete operations.
Data Source
AI summary
A method may include receiving, at a device, a copy command, wherein the copy command comprises a first indication of a first amount of source data and a second indication of a second amount of source data, determining, based at least in part on the first indication, an amount of destination space, and blocking at least a portion of the amount of destination space. The method may further include reading the first indication, and reading the second indication, wherein the amount of destination space may include at least a first portion of the first amount and at least a second portion of the second amount. The blocking may include blocking the at least the first portion of the first amount and the at least the second portion of the second amount. The method may further include storing the first indication to generate a stored first indication.