I'm working on the specifications for a very small Ceph cluster for VM images 
(OpenStack/QEMU-KVM/etc).

I'm being asked to justify sticking with the default redundancy levels (size=3, 
min_size=2) rather than dropping them to
size=2, min_size=1.

Can someone help me articulate why we should be keeping 3 copies, beyond "it's 
the default"?

-- Ian

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