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Hi,

I'm looking at what the state of play is for using Erasure coding with a 
multi region topology (ahem - again). It seems to me that (as of approx 
2.15) the recommended way to design this makes use of:

- ec_duplication_factor and

- composite rings

The former is clearly just a parameter, whereas the composite rings 
require a number of individual rings (each placing stuff in a single 
region) joined together with...err - yes that's my question: with what? 
I see some code (compose_rings in common/ring/composite_builder.py) that 
look to be what I need to use, but there is no handy binary calling any 
of this stuff (that I can see anyway). Are we supposed to do a bit of 
python for ourselves to use these? (rubs hands ready to hack...)...

Cheers

Mark