Note_Tech

All technological notes.

---

Project maintained by simonangel-fong Hosted on GitHub Pages — Theme by mattgraham

AWS Storage - Elastic File System

Back

• AWS Storage - Elastic File System
  • Elastic File System
    • Performance
    • Storage Classes
    • Hands-on: EFS
  • EBS vs EFS
    • Elastic Block Storage
    • Elastic File System

---

Elastic File System

• Elastic File System

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

• Use cases:

  • content management, web serving, data sharing, Wordpress
• Uses NFSv4.1 protocol
• Uses security group to control access to EFS
• Compatible with Linux based AMI (not Windows)

• Encryption at rest using KMS

• POSIX file system (~Linux) that has a standard file API
• File system scales automatically, pay-per-use, no capacity planning!

---

Performance

• EFS Scale
  • 1000s of concurrent NFS clients, 10 GB+ /s throughput
  • Grow to Petabyte-scale network file system, automatically

• Performance Mode (set at EFS creation time)

  • General Purpose (default):
    • latency-sensitive use cases (web server, CMS, etc…)
  • Max I/O
    • higher latency, throughput, highly parallel (big data, media processing)
• Throughput Mode
  • Bursting
    • 1 TB = 50MiB/s + burst of up to 100MiB/s
  • Provisioned:
    • set your throughput regardless of storage size, ex: 1 GiB/s for 1 TB storage
  • Elastic
    • automatically scales throughput up or down based on your workloads
    • Up to 3GiB/s for reads and 1GiB/s for writes
    • Used for workloads

---

Storage Classes

• Storage Tiers (lifecycle management feature – move file after N days)
  • Standard: for frequently accessed files
  • Infrequent access (EFS-IA): cost to retrieve files, lower price to store. Enable EFS-IA with a Lifecycle Policy

• Availability and durability

  • Standard: Multi-AZ, great for prod
  • One Zone: One AZ, great for dev, backup enabled by default, compatible with IA (EFS One Zone-IA)

• Over 90% in cost savings

---

Hands-on: EFS

• Create security group

• Create efs

• Attach to multple EC2

---

EBS vs EFS

Elastic Block Storage

• EBS volumes…

  • one instance (except multi-attach io1/io2)
  • are locked at the Availability Zone (AZ) level
  • gp2: IO increases if the disk size increases
  • io1: can increase IO independently

• To migrate an EBS volume across AZ

  • Take a snapshot
  • Restore the snapshot to another AZ
  • EBS backups use IO and you shouldn’t run them while your application is handling a lot of traffic

• Root EBS Volumes of instances get terminated by default if the EC2 instance gets terminated. (you can disable that)

---

Elastic File System

• Mounting 100s of instances across AZ
• EFS share website files (WordPress)
• Only for Linux Instances (POSIX)
• EFS has a higher price point than EBS
• Can leverage EFS-IA for cost savings
• Remember: EFS vs EBS vs Instance Store

---

TOP