Memory Controller Mapping Table Update for SSD Lifespan
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Solution Overview
Problem
In modern standby mode, data storage apparatuses frequently switch between ordinary and low power consumption modes, leading to increased data volume being written to non-volatile memory, which shortens the lifespan of the memory.
Innovation Solution
A data storage apparatus with a memory controller that updates a second mapping table in non-volatile memory using flags from a volatile memory, only writing changed parts of the mapping table to non-volatile memory when entering low power consumption mode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the memory controller writes the complete L2P mapping table to non-volatile memory when entering low power consumption mode, then data safety is ensured, but the volume of data written increases greatly and the lifespan of non-volatile memory is shortened
Solution Approach 1:
The patent divides the L2P mapping table into multiple entries, each with a flag indicating whether it has been modified. Instead of writing the complete mapping table, only the modified entries (where flag=1) are written to non-volatile memory. This segmentation approach reduces the data volume while ensuring data safety through selective updates.
Solution Approach 2:
The patent applies partial action by writing only the necessary portion of the mapping table (modified entries) rather than the complete table. The flag mechanism identifies which entries need updating, allowing the system to perform minimal necessary writes to maintain data safety without unnecessary writes that would reduce memory lifespan.
2Use of energy by stationary object
If the data storage apparatus frequently switches between ordinary mode and low power consumption mode, then power consumption is reduced, but the volume of data written to non-volatile memory increases greatly
Solution Approach 1:
The patent uses flags to preliminarily mark which mapping table entries have been modified before entering low power consumption mode. This preliminary identification allows the system to prepare only the necessary data for writing, reducing the volume of data transferred during mode transitions while maintaining the ability to frequently switch modes for power savings.
Solution Approach 2:
The flag mechanism provides feedback about which mapping table entries have changed, enabling the memory controller to make informed decisions about what data needs to be written. This feedback loop ensures that only necessary data is written, reducing overall data volume while allowing frequent mode switching for energy efficiency.
3Stability of the object's composition
If the memory controller writes the complete L2P mapping table to non-volatile memory, then data consistency is maintained, but the frequency of writing operations increases
Solution Approach 1:
The patent segments the L2P mapping table into individual entries with associated flags. This segmentation allows the system to maintain data consistency by tracking changes at the entry level rather than treating the entire table as a unit, thereby reducing the frequency of complete table writes while ensuring consistency through selective updates of only modified entries.
Solution Approach 2:
The patent implements a mechanism where modified mapping table entries are discarded from the volatile memory and recovered to non-volatile memory only when necessary. The flag system tracks which entries need to be recovered, allowing the system to maintain data consistency without performing unnecessary write operations, thus reducing writing frequency.
Data Source
AI summary
The present invention discloses a data storage apparatus and an operation method thereof. The data storage apparatus includes a non-volatile memory, a volatile memory coupled to the non-volatile memory, and a memory controller coupled to the non-volatile memory and the volatile memory. The memory controller is configured to perform following operations: receiving a modern standby notification from a host; and updating a second mapping table stored in the non-volatile memory according to a number of flags and a first mapping table stored in the volatile memory.