Flash Memory Controller Cache Flush Delay Management
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Solution Overview
Problem
Flash memory storage systems experience delays when flushing data from cache memory due to the time required to write large quantities of data into physical units, which can exceed acceptable processing times, leading to performance issues.
Innovation Solution
A data management method and controller that temporarily store data in cache memory and determine if the time to write this data into flash memory exceeds an upper limit processing time, proactively writing a portion of the data into physical units when this threshold is reached, thereby avoiding delays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a cache memory is allocated to temporarily store writing data, then the writing speed is improved, but the time required to flush data from cache memory to physical units increases
Solution Approach 1:
The system proactively determines whether the time required to write data from cache memory to physical units exceeds an upper limit processing time, and if so, writes a portion of the data in advance before the host issues a flush command. This preliminary action prevents the flushing delay by ensuring data is transferred to physical units within acceptable time limits.
2Productivity
If a great quantity of data is temporarily stored in the cache memory, then the writing performance is improved, but the flushing operation takes a very long time
Solution Approach 1:
The system continuously monitors the amount of data stored in cache memory and determines whether flushing this data would exceed the upper limit processing time. This feedback mechanism allows the system to proactively manage cache data by writing portions to physical units before the host issues a flush command, thereby maintaining writing performance while avoiding flushing delays.
3Loss of time
If data is written directly into physical units without cache memory, then the flushing time is reduced, but the writing speed decreases
Solution Approach 1:
The system uses cache memory to temporarily store writing data at high speed, then proactively determines whether the time required to write this data to physical units exceeds an upper limit. When the limit would be exceeded, the system writes a portion of the data in advance, ensuring that flushing operations complete within acceptable time limits while maintaining high writing speed through cache memory.
Data Source
AI summary
A data management method for a flash memory storage system having a cache memory is provided. The data management method includes writing data into a flash memory when a write command is executed, and determining currently a state of all the writing data which is temporarily stored in the cache memory. Wherein, if the state indicates that a time for writing all the writing data temporarily stored in the cache memory into a flash memory may exceed an upper limit processing time, a portion of the writing data temporarily stored in the cache memory is first written into the flash memory. Accordingly, the data management method may effectively avoid a delay caused by a flush command issued from the host for flushing the cache memory.