Ceph see the data size larger than actual stored data in rbd

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Hi ,

I found some thing strange in ceph. The actual stored data in mounted rbd image is 156 G .
/dev/rbd0p1     985G  156G  779G  17% /mnt 

When I run ceph -s , I see the actual data is 316 GB. 

      pgmap v27446382: 1024 pgs, 1 pools, 316 GB data, 81742 objects
            952 GB used, 44145 GB / 45098 GB avail

also when I write some thing on the mount rbd and then remove it the available space seen true in the mounted rbd , but with ceph -s command the data become larger and can not see the data is removed.

I understand the replication, I mean the actual data without replication. When I remove some data , the ceph cluster can not see the new size of data and does not change the data size.

Please , any help in this problem. 

Thank you 

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