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Answer: Use the Amazon Elastic File System (Amazon EFS) Standard storage class. Create a lifecycle management policy to move infrequently accessed data to EFS Standard-Infrequent Access (EFS Standard-IA).
## Explanation **Key Requirements Analysis:** 1. **POSIX-compliant storage** - This eliminates Amazon S3 options (A and B) because S3 is object storage and not POSIX-compliant. POSIX compliance is required for file system semantics. 2. **Highly available across multiple Availability Zones** - This eliminates option D (EFS One Zone) which is only in a single AZ. 3. **Shareable across EC2 instances** - EFS is designed for this purpose. 4. **Maximum data durability** - EFS Standard storage class provides 11 9's (99.999999999%) durability. 5. **Cost-effective with access pattern changes** - Data accessed frequently for first 30 days, then infrequently. **Why Option C is Correct:** - **Amazon EFS Standard storage class** meets all requirements: - POSIX-compliant file system - Highly available across multiple AZs - Shareable across multiple EC2 instances - Maximum data durability (11 9's) - **EFS Lifecycle Management** automatically moves files to EFS Standard-IA after 30 days of not being accessed, which is cost-effective for infrequently accessed data. - EFS Standard-IA is 85% cheaper than EFS Standard for storage costs. **Why Other Options are Incorrect:** - **A & B**: Amazon S3 is not POSIX-compliant and cannot be mounted as a file system on EC2 instances. - **D**: EFS One Zone is not highly available across multiple AZs, violating the high availability requirement. **Cost Optimization:** The combination of EFS Standard for frequently accessed data and automatic transition to EFS Standard-IA after 30 days provides the most cost-effective solution while meeting all technical requirements.
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A company runs an application on Amazon EC2 Linux instances across multiple Availability Zones. The application needs a storage layer that is highly available and Portable Operating System Interface (POSIX)-compliant. The storage layer must provide maximum data durability and must be shareable across the EC2 instances. The data in the storage layer will be accessed frequently for the first 30 days and will be accessed infrequently after that time.
Which solution will meet these requirements MOST cost-effectively?
A
Use the Amazon S3 Standard storage class. Create an S3 Lifecycle policy to move infrequently accessed data to S3 Glacier.
B
Use the Amazon S3 Standard storage class. Create an S3 Lifecycle policy to move infrequently accessed data to S3 Standard-Infrequent Access (S3 Standard-IA).
C
Use the Amazon Elastic File System (Amazon EFS) Standard storage class. Create a lifecycle management policy to move infrequently accessed data to EFS Standard-Infrequent Access (EFS Standard-IA).
D
Use the Amazon Elastic File System (Amazon EFS) One Zone storage class. Create a lifecycle management policy to move infrequently accessed data to EFS One Zone-Infrequent Access (EFS One Zone-IA).