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Zorluk: OrtaResilient and Highly Available Storage Infrastructure

A digital real estate enterprise operates a property document management portal on AWS. The portal hosts critical PDF appraisal reports and legal deeds that require 99.999999999%99.999999999\% (11 nines) of data durability. These documents are frequently accessed during the first 3030 days of a listing. After this period, they are rarely accessed, but agents must be able to retrieve them in real-time (latency under 11 second) during client meetings, establishing a Recovery Time Objective (RTO) of less than 1010 seconds. The architecture must remain highly available (99.9%99.9\% availability) and resilient to the loss of an entire AWS Availability Zone (AZ). Which storage strategy meets these requirements most cost-effectively?

  1. Store the files in Amazon S3 Standard. Use an S3 Lifecycle policy to transition the files to Amazon S3 Glacier Instant Retrieval after 3030 days.Cevap
  2. B
    Store the files in Amazon S3 Standard. Use an S3 Lifecycle policy to transition the files to Amazon S3 Glacier Flexible Retrieval after 3030 days, utilizing standard retrieval when agents request files.
  3. C
    Store the files in an Amazon RDS database. Configure an RDS Read Replica in another Availability Zone, and design the application to perform immediate, automatic database failover to this replica if the primary instance fails.
  4. D
    Store the files on Amazon EBS volumes. Set up a Pilot Light disaster recovery strategy in a secondary Region to achieve near-zero recovery time (RTO) for real-time document access by keeping compute resources in a stopped state.

Cevap

Store the files in Amazon S3 Standard. Use an S3 Lifecycle policy to transition the files to Amazon S3 Glacier Instant Retrieval after 30 days.
Amazon S3 Glacier Instant Retrieval is designed for archiving data that is rarely accessed but requires millisecond retrieval times when requested. It provides the same 11 nines of durability and availability across multiple Availability Zones as S3 Standard, meeting all resilience and RTO constraints while optimizing costs.

Adım Adım Çözüm

1
Analyze durability, availability, and recovery requirements.
The system requires 99.999999999%99.999999999\% durability, 99.9%99.9\% availability, multi-AZ resilience, and real-time retrieval (latency under 11 second) after 3030 days.
This establishes the constraints for choosing the appropriate storage tier.
2
Evaluate Amazon S3 storage classes against RTO requirements.
Amazon S3 Standard and Amazon S3 Glacier Instant Retrieval both offer 99.999999999%99.999999999\% durability and multi-AZ resilience. S3 Glacier Instant Retrieval provides retrieval in milliseconds, satisfying the RTO.
Standard Glacier classes like Glacier Flexible Retrieval take hours to retrieve data and cannot meet the real-time access requirement.
3
Compare cost-effectiveness.
S3 Glacier Instant Retrieval has a lower storage cost than S3 Standard, making it the most cost-effective choice for rarely accessed documents that require immediate access.
Using S3 Lifecycle policies to automate the transition minimizes costs without manual intervention.

Anahtar Kavram

Selecting resilient and cost-effective AWS storage classes based on RTO and retrieval latency requirements
Tahmini Süre:1m 30s
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Resilient and Highly Available Storage Infrastructure

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