[pve-devel] ceph replication speed

Dietmar Maurer dietmar at proxmox.com
Mon Dec 30 18:47:24 CET 2013


> size=3:
> When you write to only three OSDs, each one replicates to two more OSDs, a
> total of 9 OSD writes.
> Half of the OSDs make two writes, I would expect reduced performance with
> 50% of the OSDs doing twice the work.

Thought a bit more about that, it does not really explain the slowdown. If all 6 OSD writes
the overall throughput should be even better.

Anyway, I will test that.



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