On 04/28/2014 02:35 PM, Timofey Koolin wrote:
What will happened if RBD lose all copied of data-block and I read the block?
The read to the object will block until a replica comes online to serve it. Remember this with Ceph: "Consistency goes over availability"
Context: I want use RDB as main storage with replication factor 1 and drbd for replication on non rbd storage by client side. For example: Computer1: 1. connect rbd as /dev/rbd15 2. use rbd as disk for drbd Computer2: Use HDD for drbd-replication. I want protect from break of ceph system (for example while upgrade ceph) and long-distance replication.
Ceph wants to be consistent at all times. So copying over long distances with high latency will be very slow.
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