Management of metadata in a solid-state drive via write heat segregation

A solid-state drive (SSD), comprising:

• a flash memory;
• and
• a controller coupled to the flash memory, wherein the controller performs operations, the operations comprising:
• maintaining a logical-to-physical translation layer, wherein metadata for the logical-to-physical translation layer is stored in metadata pages in the flash memory of the SSD;
• tracking a write heat of the metadata pages;
• caching relatively more frequently accessed metadata pages in a non-durable cache of the SSD;
• and
• prioritizing, by the controller, metadata write operations based on write heat of the metadata pages, such that a NAND flash block of the flash memory contains metadata pages with a similar write heat, wherein extents with similar write heats are grouped together into a stripe that stores extent data, and wherein write heats of the extents with the similar write heats do not differ from each other beyond a predetermined threshold.

A computational device, comprising:

• a processor;
• and
• a solid-state drive (SSD) coupled to the processor, the solid-state drive comprising:
• a flash memory;
• and
• a controller coupled to the flash memory, wherein the controller performs operations, the operations comprising:
• maintaining a logical-to-physical translation layer, wherein metadata for the logical-to-physical translation layer is stored in metadata pages in the flash memory of the SSD;
• tracking a write heat of the metadata pages;
• caching relatively more frequently accessed metadata pages in a non-durable cache of the SSD;
• and
• prioritizing, by the controller, metadata write operations based on write heat of the metadata pages, such that a NAND flash block of the flash memory contains metadata pages with a similar write heat, wherein extents with similar write heats are grouped together into a stripe that stores extent data, and wherein write heats of the extents with the similar write heats do not differ from each other beyond a predetermined threshold.