EC2 Flashcards
What is the maximum number of EC2 instances that can be attached to a EBS Multi-Attach volume (io family)
16
What is EBS Multi-Attach?
A feature that lets you attach one io1 or io2 EBS volume to multiple EC2 instances in the same availability zone
Can you use EBS Multi-Attach to attach volumes across availability zones?
No
What is the EBS Instance Store?
Short-lived (ephemeral) storage available on the same host as a running EC2 instance. Ideal for cached data or scratch areas.
What is an AMI?
Amazon Machine Image
What EBS volume type has the highest performance?
io1 & io2 block express
What is the general purpose SSD EBS volume type?
gp2 & gp3
What EBS volume type is best for less frequently accessed data?
sc1 (HDD)
What EBS volume types can be used as boot volumes?
gp2, gp3, io1 & io2 (any SSD)
What is the best EBS volume type for database workloads that require high performance?
io1 or io2
What is EFS?
Elastic File System - managed network file system that can be mounted on many EC2 instances across availability zones. Is about 3x more expensive than gp3
What is a use case of EFS?
Content management, web serving, data sharing
How is access to an EFS managed?
A security group
What operating systems can EFS be used with?
Linux based only
What are the two main storage tiers for EFS?
Standard (for frequently accessed files) and Infrequent Access. A policy can be created to automatically move files to the IA tier to help save money
Can you configure a EFS for just one AZ (availability zone)?
Yes, this could be useful for development compared to production
What are the three main throughput modes for EFS?
Enhanced Elastic (best for workloads with unpredictable IO). Bursting (throughput scales with amount of storage). Provisioned (best when you can estimate workload in advance).
What does EBS stand for?
Elastic Block Storage
How do you migrate an EBS volume across AZ?
Take a snapshot, restore the snapshot to another AZ
Can you use an AMI from one region to create an instance in a different region?
No
You are running a high-performance database that requires an IOPS of 310,000 for its underlying storage. What do you recommend?
EC2 Instance Store (because io2 has a max IOS of about 250,000)
Which EC2 Purchasing Option can provide you the biggest discount, but it is not suitable for critical jobs or databases? Dedicated hosts, Spot instances or Convertible reserved instances?
Spot instances
How long can you reserve an EC2 Reserved Instance?
1 OR 3 years
What is IMDS?
Instance MetaData Service
