CAPACITY-EFFICIENT BLOCKS IN QLC A BYTE-GRANULAR, THIN-PROVISIONED, SHARDED, INFINITELY-SCALABLE DATA STORE ELEMENT STORE ATTRIBUTES: RICH, SHARED-EVERYTHING METADATA IN 3D XPOINT POSIX & S3 METADATA, MULTI-PROTOCOL MAPPINGS, LINKS, LOCK STATE, SNAP STATE, KEYS 1 4 V A S T D A T A O V E R V I E W