Force cephfs delayed deletion

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Hello,

I see that free space is not released after files are removed on CephFS.

I'm using Luminous with replica=3 without any snapshots etc and with default settings.


From client side:

$ du -sh /mnt/logs/
4.1G /mnt/logs/
$ df -h /mnt/logs/
Filesystem   Size  Used Avail Use% Mounted on
h1,h2:/logs  125G   87G   39G  70% /mnt/logs

These stats are after couple of large files were removed in /mnt/logs dir, but that only dropped Useв space a little.
Doing 'sync' command also changes nothing.

From server side:
# ceph  df
GLOBAL:
    SIZE     AVAIL      RAW USED     %RAW USED
    124G     39226M       88723M         69.34
POOLS:
    NAME                ID     USED       %USED     MAX AVAIL     OBJECTS
    cephfs_data         1      28804M     76.80         8703M        7256
    cephfs_metadata     2        236M      2.65         8703M         101

Why there are such a large difference between 'du' and 'USED'?

I've found that it could be due to 'delayed delete' http://docs.ceph.com/docs/luminous/dev/delayed-delete/

And previously it seems could be tuned by adjusting the "mds max purge files" and "mds max purge ops" 

http://lists.ceph.com/pipermail/ceph-users-ceph.com/2016-October/013679.html

But there is no more of such options in http://docs.ceph.com/docs/luminous/cephfs/mds-config-ref/


So the question is - how to purge deleted data and reclaim free space?

Thank you.



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