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Been trying to find out why sharding across two data centers was failing, one in Florida, one in Canada.
All shards were reachable by each other.
Found a post stating that the cfg servers had to be within 30s of each other, ours were 2 minutes apart (3 mongos units). It would be really useful, and timesaving, if the time element could be mentioned high on the docs, especially for those of us that are building systems across multiple data centres.
this one took me out for a couple of days trying to track it down..... but I know now 
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