Storage Device Namespace Capacity Management
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Solution Overview
Problem
Conventional storage systems face issues when receiving data larger than the available space in a namespace, leading to potential data loss and reliability concerns due to insufficient capacity, as they often process such data as a failure rather than finding alternative storage solutions.
Innovation Solution
The method involves determining if the available space in a namespace is insufficient, allocating a temporary space from a different namespace with available capacity, and storing the data there, while notifying the host of the allocation and ensuring data continuity and reliability by flushing data to an external storage device when necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If data is stored in a namespace when available space is insufficient, then data loss is prevented, but storage reliability deteriorates without alternative storage solutions
Solution Approach 1:
The patent introduces a temporary space as an intermediary storage location between the full namespace and external storage devices. When a namespace reaches capacity, data is redirected to this temporary space within the same storage device, preventing data loss while maintaining namespace integrity. This intermediary mechanism resolves the contradiction by providing an intermediate buffer that preserves reliability without immediately externalizing data.
Solution Approach 2:
The storage system is segmented into multiple namespaces with individual capacity management. When one namespace becomes full, the system segments the storage problem by allocating temporary space from other namespaces or creating dedicated temporary spaces. This segmentation allows independent management of storage resources, enabling data to be preserved in alternative locations within the same device without affecting the original namespace structure.
2Productivity
If conventional storage systems process data larger than namespace capacity as failure, then data integrity is maintained, but productivity deteriorates due to data loss
Solution Approach 1:
The patent converts the harmful condition of namespace fullness into a beneficial opportunity for data preservation. Instead of treating capacity exhaustion as a failure state, the system automatically redirects data to temporary spaces and external storage devices. This transforms what would be data loss into a chance to expand effective storage capacity and maintain processing continuity, improving productivity without compromising data integrity.
Solution Approach 2:
The system performs preliminary actions by pre-allocating temporary spaces and establishing redirection mechanisms before namespace capacity is exhausted. This proactive approach ensures that when data overflow occurs, the system is already prepared with alternative storage paths, maintaining both data integrity and processing continuity without interruption or failure states.
3Adaptability or versatility
If temporary space is allocated from another namespace, then storage flexibility is improved, but device complexity increases due to namespace management
Solution Approach 1:
The storage system implements self-service mechanisms through automated namespace management. The controller automatically monitors namespace capacity, identifies available temporary spaces in other namespaces, and performs data redirection without external intervention. This self-managing approach handles the increased complexity internally, allowing the system to maintain high storage flexibility while shielding users from the underlying management complexity through automated operations.
Data Source
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AI summary
An operation method of a storage device includes, when receiving a write request for a first namespace among a plurality of namespaces logically divided and recognized by an external host device, determining whether an available space of the first namespace is insufficient; when it is determined that the available space of the first namespace is insufficient, allocating a portion of an available space of a second namespace different from the first namespace from among the plurality of namespaces to a temporary space for the first namespace; transmitting information about a lack of the available space of the first namespace and information about the allocation of the temporary space of the second namespace to the external host device; and storing data corresponding to the write request for the first namespace in the temporary space of the second namespace.