Multi-Node Storage Volume Segmentation for Balanced IO
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Solution Overview
Problem
Conventional multi-node storage systems face limitations in performance and bandwidth utilization, as volumes are often optimized for one node, leading to suboptimal performance on non-optimized nodes, and balancing performance between nodes is challenging, especially when some volumes are busier than others.
Innovation Solution
The approach involves dividing a volume into segments and assigning them to multiple nodes, defining IO request paths based on node assignments, storing metadata and caching user data on each node, and reassigning segments in case of node failure, allowing for more efficient and balanced IO processing across nodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a volume is optimized for one node in a multi-node storage system, then performance on that node is improved, but performance on other nodes deteriorates significantly
Solution Approach 1:
The volume is divided into multiple segments, with each segment assigned to a different node. This segmentation allows each node to have optimized performance for its assigned segments while maintaining the ability to access other segments through defined IO request paths, thus resolving the contradiction between single-node optimization and multi-node adaptability.
Solution Approach 2:
The patent introduces a new dimension of volume organization by dividing volumes into segments that can be independently assigned to different nodes. This dimensional change from whole-volume assignment to segment-level assignment enables fine-grained control over node performance and access patterns across the multi-node system.
2Adaptability or versatility
If volumes are shared between multiple nodes, then multi-node access is enabled, but performance is limited to half of the maximum bandwidth
Solution Approach 1:
By segmenting the volume and assigning different segments to different nodes, the system enables parallel processing of IO requests across multiple nodes. Each node can process IO requests for its assigned segments at full bandwidth, effectively utilizing the total system bandwidth rather than being limited to half.
Solution Approach 2:
The patent establishes defined IO request paths that enable continuous and efficient data flow between nodes and segments. This ensures that useful actions (data processing) continue without interruption or bandwidth limitations, allowing the system to maintain high productivity while supporting multi-node access.
3Reliability
If locking mechanisms are used for IO requests on non-optimized nodes, then data consistency is maintained, but performance deteriorates significantly
Solution Approach 1:
Segmentation allows IO requests to be directed to the node that owns the relevant segment, eliminating the need for locking mechanisms. Since each node has direct access to its assigned segments, data consistency is maintained through ownership rather than locking, and performance is preserved by avoiding the overhead of lock negotiation.
4Ease of operation
If volumes are concentrated in one node, then simplified management is achieved, but performance balancing between nodes becomes difficult
Solution Approach 1:
Segmentation provides a middle ground between centralized and distributed management. While the volume is divided into segments assigned to different nodes (enabling performance balancing), the segmentation is managed through a systematic approach that maintains operational simplicity. Each node manages its assigned segments independently, simplifying node-level operations while achieving system-level performance balance.
Data Source
AI summary
A method, computer program product, and computing system for dividing a volume into a plurality of segments. The plurality of segments may be assigned to a plurality of nodes of a multi-node storage system. One or more input/output (IO) request paths for accessing the plurality of segments may be defined based upon, at least in part, assigning the plurality of segments to the plurality of nodes.