From 2057b43ce81e3985eb2676cf76762502163843dd Mon Sep 17 00:00:00 2001 From: Corey Quinn Date: Sun, 20 Oct 2019 08:48:38 -0400 Subject: [PATCH] Add info about Zone IDs (#730) --- README.md | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/README.md b/README.md index 6eaceb3..7cf3b7f 100644 --- a/README.md +++ b/README.md @@ -2365,7 +2365,7 @@ This section covers tips and information on achieving [high availability](https: ### High Availability Gotchas and Limitations -- 🔸**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. +- 🔸**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. - 🔸💸**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. Billing and Cost Management