Efficient flash management for multiple controllers

A non-transitory computer readable storage medium storing instructions, which when executed, cause a processing device to:

• access a data structure stored in memory on a storage device, the data structure comprising block metadata for each data block on the storage device, wherein the block metadata comprises an indication of a block type of each data block on the storage device and an access operation count value for each data block on the storage device;
• determine, from the data structure, a first data block on the storage device comprising a list of deallocated data blocks on the storage device, the list comprising a block number of each deallocated data block and an access operation count value at which each deallocated data block was deallocated;
• and
• compare, by the processing device, a first access operation count value associated with each of the deallocated data blocks from the data structure to a second access operation count value associated with each of the deallocated data blocks from the list of deallocated data blocks
• determine that a second data block on the list was previously labeled as comprising new data;
• and
• maintain a label of the second data block on the list as comprising new data responsive to the first access operation count value associated with the second data block from the data structure matching the second access operation count value associated with the second data block from the list of deallocated data blocks.

A system comprising:

• a storage array comprising a solid state drive;
• and
• a storage controller coupled to the storage array, the storage controller comprising a processing device, the processing device to:
• access a data structure stored in memory on a storage device, the data structure comprising block metadata for each data block on the storage device, wherein the block metadata comprises an indication of a block type of each data block on the storage device and an access operation count value for each data block on the storage device;
• determine, from the data structure, a first data block on the storage device comprising a list of deallocated data blocks on the storage device, the list comprising a block number of each deallocated data block and an access operation count value at which each deallocated data block was deallocated;
• and
• compare, by the processing device, a first access operation count value associated with each of the deallocated data blocks from the data structure to a second access operation count value associated with each of the deallocated data blocks from the list of deallocated data blocks;
• determine that a second data block on the list was previously labeled as comprising new data;
• and
• maintain a label of the second data block on the list as comprising new data responsive to the first access operation count value associated with the second data block from the data structure matching the second access operation count value associated with the second data block from the list of deallocated data blocks.