[ceph-users] how to disable write-back mode in ceph octopus

I tried cache tier in write-back mode in my cluster, but because my ssd drive is home used, can not satisfy the needs of IOPS. Now I want disable write-back mode , I founded office documents,but the doc was outdated https://docs.ceph.com/en/latest/rados/operations/cache-tiering/?highlight=ca... ）. root@e9000-22:~# ceph osd tier cache-mode cache proxy

Invalid command: proxy not in writeback|readproxy|readonly|none osd tier cache-mode <pool> writeback|readproxy|readonly|none [--yes-i-really-mean-it] : specify the caching mode for cache tier <pool> Error EINVAL: invalid command

Anyone can tell my how to disable this mode.