Re: how to set up disks in the same host

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> your client writes the file to one osd, and before this osd acknowledges your write request, 
> it ensure that it is copied to other osd(s).

I think this behaviour depends on how you configure you POOL:

osd pool default min size:
Description:
Sets the minimum number of written replicas for objects in the pool in order to acknowledge a write operation to the client. If minimum is not met, Ceph will not acknowledge the write to the client. This setting ensures a minimum number of replicas when operating in degraded mode.

Cheers,
Robert van Leeuwen
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