osd max object size
Description: The maximum size of a RADOS object in bytes.
Type: 32-bit Unsigned Integer
Default: 128MB
Before the Ceph Luminous release, the default value was 100 GB. Now it has been reduced to 128 MB. This means that unpleasant performance problems can be prevented right from the start
github.com/ceph/ceph/pull/15520
docs.ceph.com/docs/master/releases/luminous/
docs.ceph.com/docs/master/rados/configuration/osd-config-ref/