068 EFS

• Managed NFS (network file system) that can be mounted on many EC2
• EFS works with EC2 instances in multi-AZ
• Highly available, scalable, expensivee (3x gp2)

Use cases

• content management, web serving, data sharing, Wordpress

Property

• NFSv4 protocol
• Uses security group to control access from each AZ in a region
• Compatible with Linux AMI
• Encryption at rest using KMS
• POSIX file system with standard file API
• File system scales automatically
• pay-per-use, no capacity planning

Performance

Throughput mode

• Bursting: 50MiB/s, burst up to 100MiB/s
• Provisioned: set thgroughput regardless of storage size
• Elastic: automatically scale throughput (recommended)

Performance mode (set at EFS creation)

• General purpose: latensy-sensitive use cases (web server, CMS, etc)
• Max I/O: higher latency/throughput/parallel (big data, media processing)

Elastic mode cannot use Max I/O performance mode.

Storage Classes

Storage tiers

• Standard: for frequently accessed files
• Infrequent access (EFS-IA): cost to retrieve files, lower price to store
• Archive: rarely accessed files, 50% cheaper

Implement lifecycle policy to move files between storage tiers

Availability and durability

• Standard: Multi-AZ, for production
• One Zone: for development, backup enabled by default, compatible with EFS-IA