difference between qemu cache settings and ceph.conf rbd cache settings?

[Stefan Priebe - Profihost AG <s.priebe@xxxxxxxxxxxx>]

Hello list,

i've now patched my qemu to include the qemu cache settings for rbd.

Now i can change my drive caching mode. But there are also these 
settings for global section in ceph.conf.

        rbd_cache = true
        rbd_cache_size = 33554432
        rbd_cache_max_age = 2.0

How do they influence or replace each other?

thanks
Stefan
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