Parallel Node Upgrade Logic in Storage Systems
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Solution Overview
Problem
The serial upgrade process of nodes in storage systems is inefficient, especially in systems with additional nodes, as it requires sequential movement of functionality between primary and backup nodes, leading to potential disruptions and delays.
Innovation Solution
The implementation of a node upgrade logic that identifies dependencies between nodes, allowing for partial or parallel upgrades by selecting nodes for upgrade based on their dependencies, using a directed graph to determine upgrade passes and managing deployment containers to ensure continuous operation during the upgrade process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If serial upgrade process is used to ensure system stability during node upgrades, then reliability is maintained, but productivity deteriorates due to sequential upgrades and extended downtime
Solution Approach 1:
The patent segments the upgrade process into multiple independent passes, where each pass upgrades a subset of nodes that have no dependencies on each other. The system divides nodes into groups based on dependency relationships, allowing parallel execution of upgrade passes. This segmentation enables multiple nodes to be upgraded simultaneously in different passes while maintaining system stability through controlled dependency management.
2Device complexity
If serial upgrade process is used to manage node dependencies, then device complexity is reduced, but loss of time increases due to sequential processing
Solution Approach 1:
The patent performs preliminary actions by constructing a directed graph representing node dependencies before the upgrade process begins. The system pre-calculates the upgrade passes and identifies which nodes can be upgraded in parallel by analyzing the dependency structure in advance. This preliminary analysis enables the system to optimize the upgrade schedule and execute multiple passes concurrently, reducing overall upgrade time without increasing operational complexity during the upgrade execution.
3Reliability
If functionality is moved between primary and backup nodes during upgrade, then reliability is maintained, but productivity deteriorates due to functional migration overhead
Solution Approach 1:
The patent extracts the active deployment container from the primary node before the upgrade process begins and places it on a separate node that will not be upgraded in the current pass. This extraction allows the primary node to be upgraded without needing to maintain active functionality during the upgrade, eliminating the overhead of continuous functional migration. The deployment container is reactivated on the upgraded node after the upgrade completes, ensuring operational continuity without the inefficiency of repeated functionality movement.
Data Source
AI summary
An apparatus comprises a processing device that is configured to identify first and second subsets of nodes in a plurality of nodes, the first subset of nodes having dependencies with a first node in the plurality of nodes and the second subset of nodes having dependencies with a second node in the plurality of nodes. The processing device is configured to select the first node for an upgrade and to determine that the second node is not included in the first subset. The processing device is configured to determine that the first node is not included in the second subset and to upgrade the first and second nodes at least partially in parallel based at least in part on the determination that the second node is not included in the first subset and the determination that the first node is not included in the second subset.