Is this situation about data lost?

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Dear all:

I meet a strange situation. First, I show my ceph status as following:

cluster fb155b6a-5470-4796-97a4-185859ca6953
  ......
     osdmap e25234: 20 osds: 20 up, 20 in
      pgmap v2186527: 1056 pgs, 4 pools, 5193 GB data, 1316 kobjects
            8202 GB used, 66170 GB / 74373 GB avail
                1056 active+clean

The replica size of my pool configuration is 2 and 8202 GB is total
actual data usage and 5193 GB is about my actual data size.
Is that right?

I though I have 5193 GB data, at least I should use the 5193 *
2(replica size) = 10386 GB ?
Did anyone meet the same situation as me?
or I just get something misunderstanding about the data usage in ceph status?

many thanks!
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