Host Controller Parallelism in Hyperscaler Storage
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Solution Overview
Problem
Traditional storage systems face inefficiencies due to the execution of translation layers at the drive level, leading to increased write amplification and inefficient use of storage resources, particularly in flash-based solid state storage drives.
Innovation Solution
The host controller manages storage bandwidth and allocation shares within the storage system, performing physical flash address handling operations at the host controller level to improve parallelism and reduce write amplification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If translation layers are executed at the drive level, then data management functions are provided, but write amplification increases and storage resource efficiency decreases
Solution Approach 1:
The patent extracts the translation layer execution from the drive level and relocates it to the host controller level. The host controller now performs physical flash address handling operations, while the storage drives focus solely on data storage. This separation eliminates the inefficiency of drive-level translation and reduces write amplification by enabling more efficient parallel write operations.
Solution Approach 2:
The patent merges the translation layer functionality with the host controller, combining data management responsibilities at the host level. This allows the host controller to manage multiple storage drives more efficiently by coordinating write operations across multiple drives in parallel, thereby improving overall storage resource efficiency and reducing write amplification.
2Productivity
If translation layers are executed at the drive level, then data management functions are provided, but parallelism of write processes decreases
Solution Approach 1:
The patent extracts translation layer execution from individual storage drives and consolidates it at the host controller. This allows write operations to be distributed across multiple drives in parallel without each drive needing to independently perform translation operations, thereby increasing parallelism while the host controller manages the coordination.
Solution Approach 2:
The host controller is given universal responsibility for managing multiple storage drives, including performing translation operations for all drives. This multi-functional approach enables the host controller to optimize write operations across the entire storage array, improving parallelism by coordinating simultaneous writes to multiple drives without requiring complex translation logic at each drive level.
Data Source
AI summary
Write requests to store data at one or more solid-state storage devices are received by a storage controller from clients external to a storage system. A number of open segments in the storage system is identified. A determination as to whether to open one or more subsequent segments for the write requests is made based on the number of open segments and a target parallelism for the storage system. In response to determining that the one or more subsequent segments are to be opened based on the number of open segments and the target parallelism, the one or more subsequent segments are opened.