rbd export hangs / does nothing without regular drop_cache

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Hi,

I've a machine doing rbd backup with the rbd export command. Around 10tb each day. After some days it starts to get very slowly and the rbd commands seem to do nothing. If I run echo 3 > drop_caches they starts immediately again to get traffic and dumping data.

What's wrong here?

Kernel 4.1.10
ceph firefly

Greets,
Stefan

Excuse my typo sent from my mobile phone.
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