EBS

1. characteristics

1.1. attach /detach to different EC2

1.2. locked to AZ

1.3. net work drive i.e not physical

1.4. provisioned capacity

1.4.1. size GB

1.4.2. IOPS

1.4.3. billing base

1.4.4. reseizeable (increase only)

1.4.4.1. repartition before use

1.5. Types

1.5.1. GP2 (SSD)

1.5.1.1. balance price/performance

1.5.1.2. most workloadds

1.5.2. IOI (SSD)

1.5.2.1. high performance

1.5.2.2. mission-critical

1.5.2.3. low latency or high troughput

1.5.2.4. high price

1.5.3. STI (HDD)

1.5.3.1. low cost

1.5.3.2. frequently accessed

1.5.3.3. throughput intensive workloads - BIG DATA

1.5.4. SCI (HDD)

1.5.4.1. lowest cost

1.5.4.2. as STI, access less frequently

2. instance store

2.1. no root EBS

2.2. better IO

2.3. lost on termination

2.4. can't resize

2.5. backups operated by user

3. Why?

3.1. termination != root volume persist

4. capabilities

4.1. EBS encryption

4.1.1. Data rest encrypted

4.1.2. data ec2<->ebs encrypted

4.1.3. snapshots encrypted

4.1.4. automatically

4.1.5. keys from KMS (AES-256)

4.2. snapshots

4.2.1. why?

4.2.1.1. resizing

4.2.1.2. change volume type

4.2.1.3. encrypt volume

4.2.1.4. backup

4.2.2. size = data used volume