How heketi allocates bricks

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The simple ring allocator is Heketi's algorithm used to determine where to place bricks across a single cluster. The goal of the algorithm is to return to the caller a list of devices, where the order of devices have been arranged according to their failure domain. For example, the caller could receive a list like the following:

[ 
    {Zone3, Node 192.168.13.100, Device /dev/sd...

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