➜  ~ cat /sys/block/sda/queue/
add_random              discard_max_hw_bytes    io_poll_delay           max_discard_segments    max_segment_size        optimal_io_size         scheduler               write_same_max_bytes                          
chunk_sectors           discard_zeroes_data     iosched/                max_hw_sectors_kb       minimum_io_size         physical_block_size     stable_writes           write_zeroes_max_bytes                        
dax                     fua                     iostats                 max_integrity_segments  nomerges                read_ahead_kb           virt_boundary_mask      zone_append_max_bytes                         
discard_granularity     hw_sector_size          io_timeout              max_sectors_kb          nr_requests             rotational              wbt_lat_usec            zoned                                         
discard_max_bytes       io_poll                 logical_block_size      max_segments            nr_zones                rq_affinity             write_cache             zone_write_granularity