thank for your answer. Can you explain clearly for me about: 

- How does ceph's deleting object operator work? (it mean about how delete object flow in ceph works?)  

- using s3cmd tool which install in client to delete object, how to improve speed of delete object operator (objects/s) with it, current speed is 32-36 objs/s at point 90M-100M object, using 1 client, running 1 process delete ( s3cmd del -r s3://mybucket/2019)

This is option for radosgw-admin tool.

k