AWS cross-AZ data transfer costs more than they tell you

[QuinnyPig]

The short version: cross-region and cross-AZ data transfer costs the same.

[ironfootnz]

AWS Calculator only works for infra structure. People still forgets about indirect charges.

Believe me, they're making a killing $$$ there.

A survival tip if you have 10TB of data to replicate across regions.

Share via VPC across replications(you will increase latency a bit but saves around $10.00 every sync.

In case you do this every hour, it's like saving the price of an car.

Images? Share via VPC.

Don't use any managed service.

[GhettoMaestro]

Can you elaborate a bit more. Are you referring to SaaS services they offer like S3? EG: Host your own filestore on IaaS components only?

[CaliforniaKarl]

Thinking on it, that doesn’t surprise me as much as I’d expect. My understanding is that different AZs within a region are physically implemented as different buildings, which are some distance apart. So you’d need the same type of network hardware for the inter-AZ links as you’d need for inter-Region links.

[pests]

But then traveling over their dedicated lines when using cross AZ might bring additional considerations than leaving their network and being exposed to internet routing.

[Elect2]

This pricing only seems make sense when the two instances are belong to different owners that are billed $0.01/GB both. But still ridiculous: Data transfer in from internet is free, but from another zones/regions cost $0.01. Maybe they just want to make the pricing "look cheaper"?

[deepsun]

What about GCS? They say cross-AZ is free, and cross-region is the same 10c/GB. Is it really so, or like with AWS?

[rbdeveloper]

That is ridiculous. Does anyone know if that's the case with GCP / Azure too?

[nonfamous]

Charging for the sending and the receiving of the same data within a region, huh?