AWS Certified Solutions Architect Professional SAP-C02 Practice Question
A visual-effects company is migrating its on-premises Linux-based rendering farm to AWS. The new architecture will use a large fleet of Amazon EC2 Spot Instances that require concurrent access to a shared file system. The workload is characterized by highly parallel jobs that can generate more than 15,000 IOPS from hundreds of instances simultaneously. These rendering jobs are latency-sensitive and run in intense bursts for 8-10 hours a day, with very low activity at other times. The company must enforce strict POSIX-based access control for different project teams, each working in its own directory within the same file system. Which Amazon EFS configuration meets the performance, scalability, and security requirements MOST cost-effectively?
Create an Amazon EFS file system with the Max I/O performance mode and Provisioned Throughput sized for peak load. Manage access by restricting security groups on the EFS mount targets.
Create an Amazon EFS file system with the General Purpose performance mode and Bursting Throughput. Control access by attaching IAM policies to the EC2 instance roles.
Create an Amazon EFS file system with the General Purpose performance mode and Elastic Throughput. Use EFS Access Points to enforce POSIX permissions for each project team's directory.
Create an Amazon EFS file system with the General Purpose performance mode and Elastic Throughput. Use a single EFS file-system policy to grant access to an IAM role shared by all instances.
Create an Amazon EFS file system in the General Purpose performance mode with Elastic Throughput, and configure EFS Access Points-one per project directory-to enforce the required POSIX user and group IDs.
General Purpose delivers the lowest per-operation latency, which satisfies the rendering application's sensitivity. Elastic Throughput automatically and cost-effectively scales to handle the 15,000-plus IOPS bursts, charging only for the throughput consumed. EFS Access Points provide application-specific entry points that lock each team into its own directory and enforce consistent POSIX identities, eliminating cross-team access without the complexity of separate file systems.
Other configurations fail to meet one or more requirements:
General Purpose with Bursting Throughput risks exhausting burst credits during the sustained 8-10-hour render window and throttling performance.
Max I/O with Provisioned Throughput delivers performance but adds latency and incurs full-time provisioning charges; security groups cannot provide directory-level POSIX controls.
Max I/O with Elastic Throughput is not supported by AWS.
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