EBS Volumes

• Elastic Block Store
• Storage volumes that can be attached to EC2 instances
• Can be used to:
• Create file system
• Run a database
• Run Operating System
• Store Data
• Install Applications
• Designed for mission critical Production Workloads
• Automatically replicated within single AZ to protect against failure (this is automatic)
• Scalable (Dynamically increase capacity and change the type with 0 downtime)
• TYPES:
• I/O operations Per Second (IOPS)
• SDD:
  • General Purpose SSD (gp2)
  • 3 IOPS per GiB up to 13,000 IOPS per volume
    • Good for boot volumes and test applications
  • Provisioned IOPS SSD (io1)
  • High performance option and expensive
  • Up to 64,000 IOPS per volume 50 IOPS per GiB
  • Use if you need more than 16,000 IOPS
  • Designed for I/O intensive applications
  • Provisioned IOPS SSD (io2)
  • Latest generation
  • Higher Durability and more IOPS per GiB
  • SAME max IOPS
  • Same price as io2
  • 500 IOPS per GiB
  • 99.999% durability

• HDD:

  • Throughput Optimized HDD (st1) CANNOT BE BOOT
  • Low-cost HDD volume
  • Store LOADS of data
  • Throughput of 40 MB/s per TB
  • Ability to burst 250 BM/s per TB
  • Max throughput of 500 MB/s per volume
  • Big Data, Data warehouses, ETL, and log processing
  • Cold HDD (SC1)
  • Lowest Cost Option

• EBS volume types https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ebs-volume-types.html

• EBS instances created from snapshots will maintain encryption status
• Encrypted - > Encrypted
• Un-encrypted -> Un-encrypted

IOPS

• Measures number of read and write operations per seconds
• Important metric for quick transactions, low latency apps, transaction workloads
• The ability to action reads and writes very quick
• Throughput
• Measures number of bits read or written per seconds
• Important metric for large datasets, large I/O sizes, complex queries
• All about ability to deal with large datasets.