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We are running a 2 region Swift cluster with write affinity.

I've just managed to deceive myself with the Dispersion report :-( . The 
last run of the populate was Early Dec, and the corresponding report 
happily shows 100%. All good - seemingly.

However probing the actual distribution of a number of objects created 
later in Dec I see they have 3 copies in region 1 and 0 in regions 2. 
Hmm... I'm guessing that if we ran the population more frequently this 
would have been highlighted sooner. This begs the question - how 
frequently is it sensible to run the populate?

regards

Mark