Cache Space Manager Migrating Data to Onboard Memory
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Solution Overview
Problem
Multi-level cell (MLC) flash memory used in caching systems is prone to early failure due to continuous writing, leading to loss of cached contents when removable memory fails, and is cost-prohibitive to replace with single level cell (SLC) memory.
Innovation Solution
A cache space manager and error rate monitor system that transfers data from failing MLC removable memory cards to onboard SLC memory as a rescue cache, using an eviction policy to allocate space and maintain data integrity during card replacement, allowing seamless operation without shutting down the system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If MLC removable memory cards are used for caching, then storage capacity and cost-effectiveness are improved, but reliability deteriorates due to early failure from continuous writing
Solution Approach 1:
The system performs preliminary actions by monitoring error rates and operating parameters of the removable memory card before complete failure occurs. When predetermined criteria are met (error threshold, write count, or time-based), the system proactively migrates data from the removable memory card to onboard memory, preventing data loss and avoiding system shutdown.
Solution Approach 2:
The system introduces an intermediary mechanism (error rate monitor and cache space manager) that mediates between the unreliable removable memory card and the system's data storage needs. This intermediary continuously monitors the memory card's health and automatically triggers data migration when degradation is detected, shielding the system from the memory card's unreliability.
2Reliability
If SLC memory is used instead of MLC memory, then reliability is improved, but cost deteriorates
Solution Approach 1:
The system applies local quality by using different memory types for different purposes: MLC removable memory cards are used for primary caching where cost-effectiveness and capacity are priorities, while onboard SLC memory is reserved specifically as a rescue cache for data migration when the MLC card fails. This localized use of each memory type's strengths optimizes both cost and reliability.
3Reliability
If data is migrated from removable memory to onboard memory, then data preservation is improved, but device complexity increases
Solution Approach 1:
The system implements self-service by automatically monitoring its own memory card's health status and initiating data migration without external intervention. The error rate monitor continuously checks operating parameters, and when failure criteria are met, the cache space manager automatically migrates data to onboard memory, making the system self-protecting against its own component failures.
4Reliability
If the system shuts down to replace memory cards, then data loss is prevented, but productivity deteriorates
Solution Approach 1:
The system performs preliminary data migration to onboard memory before the removable memory card completely fails, ensuring data is preserved while the system remains operational. This allows memory cards to be replaced during normal operation without shutdown, as the critical data has already been safely transferred to onboard storage.
Data Source
AI summary
Systems, methods, and other embodiments associated with optimizing the use of replaceable memory cards and onboard memory as storage for data in cache are described. According to one embodiment, an apparatus includes a cache space manager configured to cause a cache processor to store data of a removable memory card of a memory device to an onboard memory of the memory device. The apparatus also includes an error rate monitor configured to monitor operating parameters of the removable memory card and to activate a cache processor to store the data from the removable memory card to the onboard memory when the operating parameters meet predetermined criteria.