Storage System Logical Unit Takeover and Data Migration
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Solution Overview
Problem
Existing storage systems require complex configurations and sophisticated skills for maintenance, especially when replacing or adding storage apparatuses, as they lack efficient mechanisms for dynamic takeover and data migration, leading to overburdened system administrators and inflexible system management.
Innovation Solution
A storage system where multiple storage apparatuses operate in a cooperative distributed manner to autonomously take over logical units, using a controller unit with takeover request, data migration, and path switch request functions to facilitate seamless replacement and addition of apparatuses without requiring extensive user intervention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If storage apparatuses are replaced or added to handle data growth, then storage capacity and performance are improved, but system complexity and difficulty of maintenance increase
Solution Approach 1:
The storage system enables self-service through automatic takeover processing where storage apparatuses autonomously determine and execute data migration and logical unit takeover without requiring complex administrator configuration. The system self-manages the replacement process by automatically detecting failed apparatuses, selecting target apparatuses, and coordinating data transfer, thereby handling capacity expansion while reducing operational complexity
Solution Approach 2:
The system prepares for future replacements by pre-establishing takeover capabilities and relationships between storage apparatuses. Before actual replacement occurs, the system already has the framework in place to automatically handle failover, including pre-configured communication channels and decision-making protocols that enable seamless transitions when apparatuses need to be added or replaced
2Reliability
If manual configuration and data migration are performed during apparatus replacement, then system reliability is maintained, but administrator workload and time consumption increase
Solution Approach 1:
The automatic takeover processing eliminates the need for administrator intervention in data migration tasks. When a storage apparatus fails or is replaced, the system automatically detects the failure, identifies suitable target apparatuses for takeover, coordinates the data migration process, and updates system configuration without human involvement, thereby maintaining reliability while dramatically reducing maintenance time
Solution Approach 2:
The system implements continuous monitoring and feedback mechanisms that detect apparatus failures and automatically trigger takeover procedures. The feedback loop ensures that the system responds to changes in real-time, automatically initiating data migration and reconfiguration processes that maintain system reliability without requiring administrator attention or time investment
3Measurement precision
If sophisticated skills are required for system management, then system control precision is improved, but ease of operation deteriorates
Solution Approach 1:
The system performs sophisticated control functions automatically without requiring skilled operators. The automatic takeover processing handles complex decisions about data migration, apparatus selection, and system reconfiguration through embedded algorithms and protocols, thereby maintaining precise system control while making the interface simple enough for non-expert users to manage
Solution Approach 2:
The system introduces an automatic control intermediary that mediates between simple user actions and complex system operations. This intermediary layer handles the sophisticated logic of data migration and apparatus coordination, translating simple administrator requests into complex coordinated actions across multiple storage apparatuses, thereby maintaining precision while improving ease of operation
Data Source
AI summary
A storage apparatus includes a drive unit in which a logical unit is formed, and a controller unit for accessing the logical unit by controlling the drive unit according to an access request sent from a host apparatus. The storage apparatus issues a logical unit takeover request to the other storage apparatuses, allocates a logical unit of another storage apparatus that will accept the transfer of the logical volume to its own logical unit according to a takeover approval sent from other storage apparatuses in response to the takeover request, and thereafter migrates data of the own logical unit to a logical unit of another storage apparatus. Subsequently, the path is switched so that the access request from the host apparatus is given to one of the other storage apparatuses.