Elastic Block Storage (EBS)

Question 1

What EBS may resemble?

Answer 1

“Virtual Hard Drive”

Question 2

What AWS service EBS can be integrated with?

Answer 2

EC2 only

Question 3

If EBS available in a single or multiple Availability Zones?

Answer 3

Single ONLY

Question 4

What are two nice features of EBS

Answer 4

Good selection of IOPS, throughput and cost models

Snapshots

Question 5

Differences between EC2 attached “instance storage” and EBS

Answer 5

Instance Storage
Bound to a single EC2 instance
Is available when EC2 instance is running
Faster than attached EBS (EBS is accessed over network)
Data goes away when EC2 instance is stopped

EBS
Can be attached to multiple EC2 instances
Ability to create snapshots at any time
Less performance because calls go over network
Can create snapshots

Question 6

EBS paying model

Answer 6

You ca buy amount of “slots” to store data upfront.

Question 7

Benefits of EBS snapshots

Answer 7

1. Create a copy of data
2. Can be created in a different Availability zone than original EBS storage
3. Cost effective backup
4. Can be shared with other user accounts
5. Convert un-encrypted to encrypted data

Question 8

What is snapshot storage model

Answer 8

Stores deltas, therefore you need entire snapshot sequence in order to restore data. User pays only for delta - changed data

Question 9

What happens if a snapshot is deleted in a sequence of snapshots.

Answer 9

The missing delta will be integrated in to next snapshot in a sequence. So we always will be able to recover data.

Question 10

Snapshot life-cycle management

Answer 10

Rules how automatically created EBS snapshots.