ceph-osd and btrfs results in high disk usage

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Hi,

i've deployed two OSDs with btrfs but i'm seeing really crazy disk / fs usage.

The xfs ones have constant 10-20MB/s the brfs one has constant 100MB/s with 5000 iop/s. And it's not btrfs it's the ceph-osd doing this amount of io at least iotop shows the ceph-osd writing this massive amount of data.

Is this correct? Has anybody seen this before?

Greets,
Stefan
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