REVERSIBLE WRITE TECHNIQUES USING PHYSICAL STORAGE DEVICE OFFLOADING: abstract simplified (17715538)

• This abstract for appeared for patent application number 17715538 Titled 'REVERSIBLE WRITE TECHNIQUES USING PHYSICAL STORAGE DEVICE OFFLOADING'

Simplified Explanation

This abstract describes a system that uses solid state drives (SSDs) for storage. The SSDs employ a log structured system (LSS) internally. When a reversible write operation is performed, the SSD writes the first data to a specific logical address. Instead of overwriting the old data stored at that logical address, the SSD updates the logical address to store the first data. The old data is moved to a physical address on the SSD, and mapping information is used to indicate that the logical address is now mapped to the physical address where the old data is stored. When a subsequent read operation is performed, the system can retrieve the old data using the retained mapping information.

Original Abstract Submitted

A system can use non-volatile solid state drives (SSDs) to provide storage. The SSDs can implement internal log structured systems (LSSs). A reversible write operation can be serviced by an SSD to write first data to an SSD logical address. The reversible write operation can update the SSD logical address to store the first data rather than old data stored at the SSD logical address prior to servicing the reversible write operation. The old data can be stored at an SSD physical address and mapping information indicates the SSD logical address is mapped to the SSD physical address. Servicing the reversible write operation can include: retaining the mapping information and the old data; and adding second mapping information that maps the SSD logical address to a second SSD physical address storing the first data. A subsequent read operation can read the old data using the retained mapping information.