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DISASTER RECOVERY

Disaster Recovery: RPO & RTO

DOWNLOADING CONCEPT: 1. THE BUSINESS METRICS (RPO & RTO)...

↳Disaster Recovery (DR) is not a technology decision; it is a business decision governed by two metrics:

  • ■RPO (Recovery Point Objective): How much data can the business afford to lose? If RPO is 1 hour, taking DB snapshots every hour is fine. If RPO is zero, you must use synchronous replication.
  • ■RTO (Recovery Time Objective): How much downtime can the business afford? If RTO is 24 hours, you can manually rebuild servers from scratch. If RTO is 5 minutes, the DR servers must already be booted and running.
▲ LIVE INCIDENTDuring a DR drill, you triggered a failover from US-East-1 to US-West-2. Route 53 successfully updated the DNS, but users are getting a '403 Forbidden' error when trying to upload files.
sre@arena:~/cloud-dr
sre@arena:~$ aws iam list-roles