Elastic Block Storage (EBS) and Elastic File System (EFS) Flashcards
Snapshots are incremental. What does this mean?
They only store the data that has changed since the last snapshot.
This makes the snapshot process more efficient and reduces storage costs.
TRUE or FALSE?
Snapshots can be taken for both the root volume (where the operating system is installed) and any additional attached EBS volumes.
TRUE
However, the root volume must be an EBS volume to create a snapshot.
How many AZs are EBS volumes replicated over?
1
TRUE or FALSE?
You can increase capacity and change the EBS volume type with no downtime.
TRUE
What EBS volume types are there?
General purpose SSD (gp2 & gp3)
Provisioned IOPS SSD (io1& io2)
Throughput Optimized HDD
Cold HDD
What are 2 use cases for gp2 volumes?
Boot volumes
Dev and test applications that aren’t latency sensitive
What’s the default volume you would use when provisioning an EC2 instance?
EBS gp2 or gp3
What’s the pricing difference between io1 and io2?
They are the same.
In the exam, when you hear anything to do with:
Big data
Data warehouses
ELT
Log processing
think of…
EBS Throughput Optimized
What are Throughput Optimized HDDs used for?
A cost-effective way to store mountains of data.
TRUE or FALSE?
Throughput Optimized HDDs can be used as a boot volume.
FALSE
What is the lowest cost EBS volume?
Cold HDD (SC1)
What is Cold HDD good for?
- Data requiring fewer scans per day
- Applications where performance is not a factor
- When you need the lowest cost
For a transactional database, would you use IOPS or Throughput?
IOPS
TRUE or FALSE?
You can reboot both EBS and Instance Store Volumes and you won’t lose your data.
TRUE
However Instance Store Volumes cannot be stopped.
TRUE or FALSE?
By default, root volumes are not deleted on termination.
FALSE
Both EBS and Instance store volumes are deleted on termination. However with EBS you can specify to keep the root device volume.
TRUE or FALSE?
With encrypted volumes, all snapshots are encrypted, as well as volumes created from the snapshots.
TRUE
TRUE or FALSE?
With encrypted volumes, the data at rest is encrypted, but not data in flight between the instance and the volume.
FALSE
Data in flight is also encrypted.
What are the 4 steps to encrypt volumes?
- Create a snapshot of the unencrypted root device volume.
- Create a copy of the snapshot and select the encrypt option.
- Create an AMI from the encrypted snapshot.
- Use that AMI to launch new encrypted instances.
What’s the maximum amount of time an EC2 instance can be hibernated for?
60 days
What can you use to automate the creation, retention, and deletion of EBS snapshots?
Amazon Data Lifecycle Manager (DLM)
TRUE or FALSE?
EBS multi-attach means you can attach the volume to multiple instances in different AZs.
FALSE
Only within one AZ.
TRUE or FALSE?
EFS works with instances in multiple AZs.
TRUE
What is more expensive? EBS or EFS?
EFS
