unrecognised command
Usage: <command> <args>
commands:
  cache_check
  cache_dump
  cache_metadata_size
  cache_repair
  cache_restore
  cache_writeback
  era_check
  era_dump
  era_invalidate
  era_repair
  era_restore
  thin_check
  thin_delta
  thin_dump
  thin_ls
  thin_metadata_pack
  thin_metadata_size
  thin_metadata_unpack
  thin_migrate
  thin_repair
  thin_restore
  thin_rmap
  thin_shrink
  thin_trim