> So, the mirroring turns a single large write into two large writes.
quoted text
> Definitely not free, but always a fixed cost.

Thanks for the explanation and the numbers. I see that's the advantage of 
copy-on-write that you can actually always cluster the metadata together and 
get always batched IO this way and then afford to do more of it. 

Still wondering what that will do to read seekiness.

-Andi
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