A company are finalizing their disaster recovery plan. A limited set of core services will be replicated to the DR site ready to seamlessly take over the in the event of a disaster. All other services will be switched off.
Which DR strategy is the company using?
- Backup and restore
- Pilot light
- Warm standby
- Multi-site
2. Pilot light
In this DR approach, you simply replicate part of your IT structure for a limited set of core services so that the AWS cloud environment seamlessly takes over in the event of a disaster.
A small part of your infrastructure is always running simultaneously syncing mutable data (as databases or documents), while other parts of your infrastructure are switched off and used only during testing.
Unlike a backup and recovery approach, you must ensure that your most critical core elements are already configured and running in AWS (the pilot light). When the time comes for recovery, you can rapidly provision a full-scale production environment around the critical core.
- This is the lowest cost DR approach that simply entails creating online backups of all data and applications.
- The term warm standby is used to describe a DR scenario in which a scaled-down version of a fully functional environment is always running in the cloud.
- A multi-site solution runs on AWS as well as on your existing on-site infrastructure in an active- active configuration.
Reference:
Rapidly Recover Mission-Critical Systems in a Disaster
An organization is planning their disaster recovery solution. They plan to run a scaled down version of a fully functional environment. In a DR situation the recovery time must be minimized.
Which DR strategy should a Solutions Architect recommend?
- Backup and restore
- Pilot light
- Warm standby
- Multi-site
3. Warm standby
The term warm standby is used to describe a DR scenario in which a scaled-down version of a fully functional environment is always running in the cloud. A warm standby solution extends the pilot light elements and preparation.
It further decreases the recovery time because some services are always running. By identifying your business-critical systems, you can fully duplicate these systems on AWS and have them always on.
- This is the lowest cost DR approach that simply entails creating online backups of all data and applications.
- With a pilot light strategy a core minimum of services are running and the remainder are only brought online during a disaster recovery situation.
- A multi-site solution runs on AWS as well as on your existing on-site infrastructure in an active- active configuration.
Reference:
Rapidly Recover Mission-Critical Systems in a Disaster
A company needs to ensure that they can failover between AWS Regions in the event of a disaster seamlessly with minimal downtime and data loss. The applications will run in an active-active configuration.
Which DR strategy should a Solutions Architect recommend?
- Backup and restore
- Pilot light
- Warm standby
- Multi-site
4. Multi-site
A multi-site solution runs on AWS as well as on your existing on-site infrastructure in an active- active configuration. The data replication method that you employ will be determined by the recovery point that you choose. This is either Recovery Time Objective (the maximum allowable downtime before degraded operations are restored) or Recovery Point Objective (the maximum allowable time window whereby you will accept the loss of transactions during the DR process).
- This is the lowest cost DR approach that simply entails creating online backups of all data and applications.
- With a pilot light strategy a core minimum of services are running and the remainder are only brought online during a disaster recovery situation.
- The term warm standby is used to describe a DR scenario in which a scaled-down version of a fully functional environment is always running in the cloud.
Reference:
Rapidly Recover Mission-Critical Systems in a Disaster
