Hanging VMs with Qemu + RBD

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Hello,

another issue we have experienced with qemu VMs 
(qemu 2.0.0) with ceph-0.80 on Ubuntu 14.04 
managed by opennebula 4.10.1:

The VMs are completly frozen when rebalancing takes place,
they do not even respond to ping anymore.

Looking at the qemu processes they are in state "Sl".

Is this a known problem / have others seen this behaviour?

I have not yet tuned any backfilling parameters and it is a
cluster of 3 hosts with one host having 6 osds and two 1 one (so 8 osds
in total).

Our qemu runs with these rbd related options:

qemu-system-x86_64 ... -drive 
    file=rbd:one/one-38:id=libvirt:key=...:auth_supported=cephx\;none:mon_host=kaffee.private.ungleich.ch\;wein.private.ungleich.ch\;tee.private.ungleich.ch,if=none,id=drive-ide0-0-0,format=raw,cache=none

Cheers,

Nico

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