Ceph rdb question about possibilities

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Hello all! 

I check the Ceph FS, but it is beta now unfortunatelly. I start to meet with the rdb. It is possible to create an image in a pool, mount it as a block device (for example /dev/rbd0), and format this as HDD, and mount it on 2 host? I tried to make this, and it's work but after mount the  /dev/rbd0 on the two host and I tried to put files into these mounted folders it can't refresh automatically between hosts. 
So the main question: this will be a possible solution?
(The task: we have 3 main node what can install the other nodes with ansible, and we want to store our rpm's in ceph it is possible. This is necessary because of high avability.)

Thanks for your help!

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