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AWS Solutions Architect > EBS 101 > Flashcards

EBS 101 Flashcards

1
Q

What is EBS?

A

Elastic Block Store is a virtual hard disk drive in the cloud.

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2
Q

What are the 5 types of EBS Storage?

A
  1. General Purpose (SSD)
  2. Provisioned IOPS (SSD)
  3. Throughput Optimized HDD
  4. Cold HDD
  5. EBS Magnetic
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3
Q

What is the use case for EBS General Purpose?

A

Most workloads. It balances performance and price.

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4
Q

What is the use case for EBS Provisioned IOPS?

A

Designed for databases, and other mission critical applications.

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5
Q

What is the use case for EBS Throughput Optimized?

A

Low cost HDD for throughput intensive workloads such as Big Data and Data Warehouses.

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6
Q

What is the use case for EBS Cold HDD?

A

Lowest cost HDD, designed for less frequently accessed workloads, such as File Servers.

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7
Q

What i the use case for EBS Magnetic?

A

Previous generation HDD for workloads where data is infrequently accessed.

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8
Q

What is the EBS gp2 Volume Type?

A

General Purpose SSD - gp2

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9
Q

What is the EBS io1 Volume Type?

A

Provisioned IOPS SSD - io1

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10
Q

What is the EBS st1 Volume Type?

A

Throughput Optimized HDD - st1

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11
Q

What is the EBS sc1 Volume Type?

A

Cold HDD - sc1

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12
Q

What is the EBS standard Volume Type?

A

EBS Magnetic - standard

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13
Q

What is Snapshot?

A

They are point int time copies of EBS volumes stored in S3. Snapshots are also incremental so only changes since the last snapshot will be moved to S3.

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14
Q

True or False: A Snapshot of an EBS Root volume must be taken while the volume is stopped.

A

False; while recommended that the volume be stopped, you can take snapshots while the instance is running.

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15
Q

When can you change an EBS volume size or storage type?

A

Changes to the size and/or storage can be made on the fly. However, these changes may take time, they are not immediate. Also, changing the volume size may require updating the OS on the root volume to use the newly allocated space.

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16
Q

Can my EBS volumes be in different AZ’s than the EC2 instance?

A

No, they will always be in the same AZ as the EC2 instance. Doing so would create latency when writing to the EC2 instance volumes.

17
Q

How do I move my EC2 instance into a new AZ?

A

Take a Snapshot of the EC2 instance, create an AMI from the Snapshot, and then use the AMI to launch a new EC2 instance in another AZ.

18
Q

How do I move my EC2 instance into a new Region?

A

Similarly to moving to a new AZ, you take a Snapshot and create an AMI, however, then you can choose to Copy the AMI to a new Region, then just as before use the AMI to launch a new EC2 instance.

19
Q

What is an AMI Instance Store volume?

A

They are storage disks that are physically attached to the host computer. They are sometimes referred to Ephemeral Storage. They are ideal for temporary storage because if the underlying host fails, all data will be lost.

20
Q

What is the difference between Instance Store and EBS backed volumes?

A
  1. Instance Store volumes cannot be stopped, only rebooted or terminated.
  2. Instance Store data can be lost if the underlying host fails.
  3. Instance Store is physically attached to the host computer whereas EBS is virtually attached.
  4. Instance Store doesn’t have the option to keep the Root device volume after the EC2 instance has been terminated.
21
Q

What is an ENI?

A

An Elastic Network Interface is essentially a virtual network card.

22
Q

What is an ENA?

A

An Enhanced Networking Adapter provides high performance networking capabilities.

23
Q

What is an EFA?

A

An Elastic Fabric Adapter accelerates High Performance Computing and machine learning applications.

24
Q

What is a use case for ENI?

A

Used for basic networking at a low cost.

25
Q

What is a use case for ENA?

A

Used when speeds between 10Gbps and 100Gbps are needed, or where reliable, high throughput is required.

26
Q

What is a use case for EFA?

A

Used when needing to accelerate High Performance Computing and machine learning applications, or if you need to do an OS by-pass.

27
Q

How can a Root Device Volume be encrypted?

A

They can be encrypted during the provisioning process.

28
Q

Can a Root Device Volume be encrypted after being provisioned?

A

Yes. Take a Snapshot, click Copy to copy the Snapshot and select “Encrypt this snapshot”. Then create an image of the encrypted Snapshot that can be loaded as an AMI onto a new EC2 instance volume.

29
Q

Can I share an encrypted Snapshot?

A

No, to share it must be an unencrypted snapshot. Unencrypted snapshots can also be shared with other AWS accounts or made public.

30
Q

Can more than 1 EC2 instance share an EBS volume?

A

No, an EBS volume can only be tied to one EC2 instance.

AWS Solutions Architect (16 decks)

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