osd replication

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Hello,

I need to understand how replication is accomplished or who is taking care of replication, osd itsef? Because we are using librados to read/write to cluster. If librados is not doing parallel writes according desired number of object copies, it could  happen that objects are in journal waiting for flush and osd went down so objects are hung in journal? Or do they already have their copies on other osds which means that librados is resposible for redundancy?

Thanks for explanation.

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