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Zorluk: OrtaDisaster Recovery Strategies

A company hosts a document archiving application on AWS. The application uses a single Amazon EC2 instance to process PDF uploads, stores the files in an Amazon S3 bucket, and writes metadata to a Single-AZ Amazon RDS for PostgreSQL DB instance. A SysOps administrator must configure a cost-effective disaster recovery (DR) strategy in a secondary AWS Region. The DR strategy must meet a Recovery Point Objective (RPO) of 4 hours and a Recovery Time Objective (RTO) of 24 hours. Which combination of actions should the SysOps administrator take to meet these requirements? (Select TWO.)

  1. Enable Amazon S3 Cross-Region Replication (CRR) to replicate documents to a bucket in the secondary Region, ensuring that versioning is enabled on both buckets.Cevap
  2. Configure Amazon RDS cross-Region automated backups replication to copy backups of the DB instance to the secondary Region.Cevap
  3. C
    Deploy an Amazon RDS read replica in the secondary Region to serve as the standby database.
  4. D
    Configure a Route 53 active-active failover routing policy to distribute traffic across both Regions.
  5. E
    Configure Amazon S3 Cross-Region Replication (CRR) to copy documents to the secondary Region without enabling versioning on either bucket.

Cevap

The correct strategy involves enabling S3 Cross-Region Replication (with versioning active on both buckets) and configuring Amazon RDS cross-Region automated backups replication.
To meet an RPO of 4 hours and an RTO of 24 hours cost-effectively, the administrator should implement a backup-and-restore DR strategy. Enabling S3 Cross-Region Replication (with versioning enabled) ensures that documents are replicated with minimal latency. Replicating Amazon RDS automated backups to the secondary Region ensures that database snapshots and transaction logs are copied asynchronously to the target region. During a disaster, the database can be restored from the replicated backups, and EC2 instances can be launched from AMIs, meeting the 24-hour RTO without incurring the cost of running database or compute instances in the secondary region during normal operations.

Adım Adım Çözüm

1
Evaluate RPO and RTO requirements to select the appropriate DR strategy.
An RPO of 4 hours and RTO of 24 hours allows for a backup-and-restore strategy where no compute or active database instances run in the DR region, maximizing cost-effectiveness.
This avoids unnecessary hourly costs for idle standby infrastructure.
2
Configure database replication for backup-and-restore.
Enabling RDS cross-Region automated backups replication copies snapshots and transaction logs asynchronously to the destination region.
This allows database restoration to the destination region within the 4-hour RPO target.
3
Configure storage replication.
Enabling S3 Versioning on both source and destination S3 buckets allows the configuration of Cross-Region Replication (CRR) to replicate documents.
Versioning is a hard requirement for S3 replication features.

Anahtar Kavram

Selecting and configuring a cost-effective backup-and-restore disaster recovery strategy using RDS cross-Region automated backups replication and S3 Cross-Region Replication with versioning.
Tahmini Süre:2m 0s
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Disaster Recovery Strategies

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