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AWS > EC2 Instance Storage > Flashcards

EC2 Instance Storage Flashcards

1
Q

What is EBS Volume?

A

Elastic Block Store

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2
Q

What does EBS do?

A

A network drive you can attach to your instances while they run

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3
Q

Why use EBS?

A

Allow your instances to persist data, even after their termination

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4
Q

How many instances can an EBS be mounted to?

A

One instance at a time

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5
Q

They are bound to a specific availability zone?

A

True

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6
Q

Can be attached to more then one instance?

A

Only after detaching from one can it be connected to another. Can be done quickly.

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7
Q

How can they be moved across zone?

A

Take a snapshot, restore snapshot to another AZ

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8
Q

Why do you need to provision capacity?

A

You get billed for that provision capacity. Capacity can be increased over time

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9
Q

You can attacked two EBS Volumes to one instance?

A

True

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10
Q

EBS Volumes can be left unattached an attached on demand?

A

True

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11
Q

By default, what happens a EBS when an ECS instance terminates?

A

The root EBS Volume is deleted
&
Any other attached EBS Volume is not deleted

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12
Q

What is a “snapshot”?

A

Make a backup (snapshot) of your EBS volume at a point in time

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13
Q

It necessary to detach volume to do a “snapshot”.

A

False. But it is recommended

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14
Q

What are 3 snapshot features?

A
  1. EBS Snapshot Archive
  2. Recycle Bin for EBS Snapshots
  3. Fast Snapshot Restored
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15
Q

What does “EBS Snapshot Archive” do?

A
  • Move a snapshot to an “archive tier” that is 75% cheaper
  • Takes within 24 to 72 hours for restoring the archive
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16
Q

What does “Recycle Bin for EBS Snapshots” do?

A
  • Setup rules to retain deleted snapshots so you can recover them from an accidental deletion
  • Specify retention form 1 day to 1 year
17
Q

What does “Takes within 24 to 72 hours for restoring the archive” do?

A
  • Force full initialization of snapshot to have no latency on the first use ($$$)
  • Particularly helpful if snapshot is big and need to initialize an EBS volume or needs to instance out of it very quickly
  • This feature costs a lot of money
18
Q

What is AMI?

A

Amazon machine image

19
Q

What does AMI do?

A

Customization of an EC2 instance

20
Q

What is the purpose of AMI?

A
  • You add your own software configuration, operating system, monitoring…
  • Faster boot / configuration time all your software is prepackaged
21
Q

AMI are built (unique) for specific region?

A

True but can be copied across regions.

22
Q

3 different kinds of AMIs?

A
    • A Public AMI: AWS provided
    • Your own AMI: you make and maintain yourself
    • An AWS Marketplace AMI: an AMI someone else made ( and potentially sells)
23
Q

Where can you launch EC2 instances from?

A

AMIs

24
Q

AMI Process (from an EC2 instance)

A
  • Start an EC2 instance and customize it
  • Stop the instance (for data integrity)
  • Build an AMI - this will also create EBS snapshots
  • Launch instances from other AMIs
25
Q

EBS volumes are …………. with good but ………. performance.

A

network drives, “limited”

26
Q

If you need high-performance hardware disk, use..

A

EC2 Instance Store

27
Q

Features:
- Better I/O performance
- EC2 Instance Instance Store lose their storage if they’re stopped (ephemeral)
- Good for buffer, cache, scratch data, temporary content
- Risk of data loss if hardware fails
- Backups and Replication are your responsibility

A

ECS Instance Store

28
Q

from an exam perspective anytime you see very high performance hardware attached volume for your EC2 Instances, think

A

local EC2 Instance Store.

29
Q

EBS volumes comes in 6 type:

A
  • gp2 / gp3 (SSD):
  • io1 / io2 Block Express (SSD)
  • st1 (HDD)
  • sc1 (HDD)
30
Q

General purpose SSD volume that balances price and performance for a wide variety of workloads

A

gp2 / gp3 (SSD)

31
Q

Highest-performance SSD volume mission-critical low-latency or high-throughput workloads

A

io1 / io2 Block Express (SSD)

32
Q

Low cost HDD volume designed for frequently accessed throughput intensive workloads

A

st1 (HDD)

33
Q

Lowest cost HDD volume designed for less frequently accessed workloads

A

sc1 (HDD)

34
Q

What is EBS Multi-Attach?

A

Attach the same EBS volume to multiple EC2 instances in the same AZ

35
Q

What is Amazon EFS?

A

Elastic File System

36
Q

What is EFS for?

A

Managed NFS (network file system) that can be mounted on many EC2

37
Q

EFS works with EC2 instances in multi-AZ?

A

True

AWS (15 decks)

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