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Zorluk: OrtaResilient and Highly Available Storage Infrastructure

A healthcare organization manages an on-premises electronic health record (EHR) system that requires low-latency, local block storage access for active patient records. The organization needs to design a resilient hybrid storage and disaster recovery solution on AWS. The solution must support a Recovery Point Objective (RPO) of 1 hour and a Recovery Time Objective (RTO) of 2 hours. In the event of an on-premises virtualization failure, the organization must be able to restore the volumes in AWS and run the EHR application on Amazon EC2 instances. Which storage configuration will meet these requirements with the lowest latency for local operations?

  1. Configure AWS Storage Gateway in Stored Volumes mode to store the primary dataset locally for low-latency access, while asynchronously backing up the data to Amazon S3 as Amazon EBS snapshots. Restore these snapshots to EBS volumes and attach them to EC2 instances during a disaster recovery event.Cevap
  2. B
    Configure AWS Storage Gateway in Tape Gateway mode to write the backup data to virtual tapes. Use lifecycle policies to transition these tapes to Amazon S3 Glacier Flexible Retrieval to minimize costs, and initiate standard retrievals to recover the tapes and restore them to EC2 during a disaster.
  3. C
    Configure AWS Storage Gateway in Stored Volumes mode. Implement a Pilot Light disaster recovery strategy by keeping a scaled-down fleet of EC2 instances running continuously in AWS, expecting that this configuration requires zero startup time or volume attachment steps during failover.
  4. D
    Configure AWS Storage Gateway in Cached Volumes mode. For the data tier, deploy Amazon RDS and configure an RDS Read Replica in the target AWS region as the primary automatic failover target to handle immediate write workloads without utilizing Multi-AZ deployments.

Cevap

Configure AWS Storage Gateway in Stored Volumes mode to store the primary dataset locally for low-latency access, while asynchronously backing up the data to Amazon S3 as Amazon EBS snapshots. Restore these snapshots to EBS volumes and attach them to EC2 instances during a disaster recovery event.
The configuration utilizing AWS Storage Gateway in Stored Volumes mode satisfies all requirements. It ensures that the entire dataset is stored on-premises to provide low-latency access to the EHR system. Additionally, it asynchronously replicates data to Amazon S3 as EBS snapshots, satisfying the low RPO. During a disaster recovery event, these snapshots can be quickly restored to Amazon EBS volumes and attached to Amazon EC2 instances, allowing the EHR application to run on AWS within the 2-hour RTO.

Adım Adım Çözüm

1
Analyze on-premises latency and access requirements.
Since the application requires low-latency, local block storage access for the EHR system, Stored Volumes mode is preferred over Cached Volumes mode because it maintains the full primary copy of the data on-premises.
Stored Volumes mode ensures all active data is stored locally for immediate access, while Cached Volumes mode only stores frequently accessed data locally.
2
Evaluate backup and recovery mechanisms for meeting RTO and RPO.
Volume Gateway Stored Volumes asynchronously backs up data to Amazon S3 as incremental EBS snapshots, satisfying a low RPO.
EBS snapshots stored in Amazon S3 can be restored directly to EBS volumes in AWS within minutes, meeting the 2-hour RTO requirement.
3
Review the recovery procedure during disaster recovery on Amazon EC2.
In a disaster recovery event, create EBS volumes from the stored EBS snapshots and attach them to newly launched Amazon EC2 instances to resume EHR application operations.
This provides a clear path to run the EHR application in AWS using standard EC2 and EBS capabilities.

Anahtar Kavram

AWS Storage Gateway Volume Gateway (Stored Volumes) provides local low-latency access to the full volume dataset on-premises while maintaining point-in-time EBS snapshots in Amazon S3 for disaster recovery and EC2 restoration.

Alternatif Yöntem

An alternative hybrid solution would be using AWS Outposts to host the active patient records and application compute locally while utilizing AWS Backup to replicate EBS volumes directly to an AWS Region. However, this is significantly more expensive and complex than AWS Storage Gateway.
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