Hello.
My real life experience tells me that this kind of setup will use much more hardware resources and will show lower benchmarks compared to recommended replicated pools on the same hardware.
Writes to ec in some cases better than replicated pools. http://en.community.dell.com/cfs-file/__key/telligent-evolution-components-attachments/13-4624-00-00-20-44-29-13/Dell_5F00_R730xd_5F00_RedHat_5F00_Ceph_5F00_Performance_5F00_SizingGuide_5F00_WhitePaper.pdf?forcedownload=true
But I am wondering, are there some real-life companies that are using EC-encoded pools to host RBD images?
Yes, with replicated cache tier pool. Because direct writes to ec pool is not possible before Luminous release. This is acceptable performance for mail boxes or archives (terabytes of screenshots, documents, logs).
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