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Most regions AZs are only a single DC, a few have more than one per AZ.

i might have remember it wrong.

does multiple buildings at single site count as multiple DC? or it must be multiple physically separate locations?

In My use of DC I’m referring to a single physical building.

Is there a list of no. Of DC per AZ? I couldnt find it anywhere

No, its only been mentioned at ReInvent publicly, or via the WikiLeaks AWS leak.