[Luminous]How to choose the proper ec profile?

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Hi all,
I am wondering how to choose the proper ec profile for new luminous ec rbd image.
If I set the k too high what the draw back would be?
 
Is it a good idea to set k=10 m=2? It sounds attempting the overhead of storage capacity is low and the redundancy is good.
 
What is the difference for storage safety(redundancy ) between k=10 m=2 and k=4 m=2?
 
What would be a good ec profile for archive purpose(decent write perfomance and just ok read performace)?
 
Thanks
2017-10-30

Frank
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