Active-active or standby

Guard 11

Choose

Orders arrive at 1,200/s. One API vCPU serves about 330 orders/s. DNS checks each region every 5 s, and clients keep an answer for 10 s. At 10:00 eu-central fails for good. Lose at most 1 percent of orders in 30 minutes, with p99 under 300 ms. Budget: 64 USD/month.

Goals

Not tested yet

The share of requests that get a correct answer.99 of 100 requests finish faster than this.What the servers and services cost each month.
Choose a design
Warm standby: 5 vCPU in eu-central, 1 scaling vCPU in eu-west (46 USD/mo)
Active-active: 2.5 vCPU in each region (42 USD/mo)
Active-active: 5 vCPU in each region (62 USD/mo)