Storage High Availability¶

Annual failure rate (AFR) of 0.1% compared to commodity drives at 4%
Availability target of 99.99%
Replication across multiple Availability Zones
Vulnerable to AZ failure
Easy to snapshot
You can copy snapshots to other regions
Supports RAID configurations

What is RAID?¶

RAID (Redundant Array of Independent Disks) is a data storage virtualization technology that combines multiple physical disk drive components into one or more logical units for the purposes of data redundancy, performance improvement, or both.

Tip¶

Use RAID 0 and RAID 1 on AWS

S3 storage¶

Standard S3 storage is designed for 99.999999999% durability and 99.99% availability
Standard S3 infrequent access is designed for 99.9% availability
One-zone infrequent access is designed for 99.5% availability
Eleven 9s of durability
Standard & Standard IA are designed for 99.99% availability

Amazon EFS¶

Implementation of NFS File System
True file system as opposed to EBS or S3
File locking, strong consistency and concurrently accessible
Each file object and metadata is stored across multiple AZs
Can be accessed by multiple EC2 instances
Can be accessed from all AZs in a region
Mount targets are highly available

Other options¶

Amazon Storage Gateway¶

Good way to migrate on-prem data to AWS for offsite backuo
Best for continuous sync needs

AWS Snowball¶

Various options for migrating data to AWS based on volume
Only for batch transfer of data

Glacier¶

Safe offsite archive storage
Low cost