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QuinnyPigmaishsk
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Add info about Zone IDs (#730)
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README.md

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@@ -2365,7 +2365,7 @@ This section covers tips and information on achieving [high availability](https:
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### High Availability Gotchas and Limitations
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- 🔸**AZ naming** differs from one customer account to the next. Your “us-west-1a” is not the same as another customer’s “us-west-1a” — the letters are assigned to physical AZs randomly per account. This can also be a gotcha if you have multiple AWS accounts.
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- 🔸**AZ naming** differs from one customer account to the next. Your “us-west-1a” is not the same as another customer’s “us-west-1a” — the letters are assigned to physical AZs randomly per account. This can also be a gotcha if you have multiple AWS accounts. Note that Zone IDs are consistent between accounts, and can be used to reliably align between AWS accounts.
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- 🔸💸**Cross-AZ traffic** is not free. At large scale, the costs add up to a significant amount of money. If possible, optimize your traffic to stay within the same AZ as much as possible.
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Billing and Cost Management

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