KB data and KB used

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Hi list,

ceph version 0.87

On a small cluster, I’m experiencing a behaviour that I have to understand (but I have reproduce that on bigger)
I pushed 300MB of data with EC 2+1 so I see 300MB data and 476MB used, right
I deleted data on buckets and after gc collector I see this report :

904 pgs: 904 active+clean; 13565 kB data, 476 MB used, 40426 MB / 40903 MB avail


So 13MB of data in cluster (thanks to gc) and still 476MB used. How I can release used block ?
If I write 25GB of data, cluster will switch to 38GB used so OSD will be reported near full or full. After deletion of this 25GB of data, OSD will stay with near full report ?

Thanks in advance for your help

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