Monitoring and Metrics

Question 1

Largest EBS size

Answer 1

16TiB

Question 2

How many instances can an EBS volume be mounted to at any time?

Answer 2

1

Question 3

What format does EBS use?

Answer 3

Raw, unformatted. Must be managed by OS

Question 4

True or false: UBS supports RAID

Answer 4

True, as long as the OS supports RAID

Question 5

True or False: EBS volume and the instance must be in the same availability zone?

Answer 5

True.

Question 6

By default, what happens to the EBS volume when the instance is terminated?

Answer 6

The volume will persist.

Question 7

By default, what happens to root volumes when the instance is deleted?

Answer 7

The root volume is deleted. Modify the DeleteOnTermination to change this.

Question 8

In order to ensure root volumes are not deleted when the instance is deleted, what must be done?

Answer 8

uncheck, or unflag the DeleteOnTermination option

Question 9

Where are EBS snapshots stored?

Answer 9

S3

Question 10

True or false: Snapshots are an exact copy of the EBS volume?

Answer 10

True: If the volume is encrypted, the snapshot and the restore will be encrypted.

Question 11

True or false: Each snapshot is a full copy of the EBS volume?

Answer 11

False: Snapshots are incremental. Only the changes since the last snapshot will be copied.

Question 12

True or false: Multiple EBS volumes can be mounted to a single instance?

Answer 12

True: While any one volume can only be attached to one instance at a time, multiple volumes can be attached to an instance.

Question 13

SSD - IOPS standard size

Answer 13

256kb I/O size

Question 14

SSD - One 1024kb operation will equal how many IOPS?

Answer 14

4

Question 15

SSD - Four 64kb sequential operations will equal how many IOPS?

Answer 15

1

Question 16

SSD - Four 64kb random operations will equal how many IOPS?

Answer 16

4. Random operations cannot be grouped together and will each be counted as an IOPS.

Question 17

What is a burst bucket?

Answer 17

Allows an EBS volume to “burst” above its basic performance.

Question 18

How are bursts allocated?

Answer 18

Through burst credits

Question 19

How are burst credits earned?

Answer 19

Volumes earn burst credits over time and depend on volume type

Question 20

True or false: Volumes can earn unlimited credits?

Answer 20

False: They are limited.

Question 21

Under what metric is the burst credits reported in CloudWatch?

Answer 21

BurstBalance metric

Question 22

What is the minimum gp2 SSD volume size?

Answer 22

1GiB

Question 23

What is the maximum gp2 SSD volume size?

Answer 23

16TiB

Question 24

What is the minimum gp2 IOPS

Answer 24

100 IOPS

Question 25

What are the two SSD volume types?

Answer 25

GP2 - General Purpose | io1 - Provisioned IOPS

Question 26

What is the maximum gp2 IOPS

Answer 26

10,000 IOPS

Question 27

How is the maximum IOPS for gp2 volumes determined?

Answer 27

3 IOPS per 1 GiB of volume size | ex. 100GiB volume = 300 IOPS

Question 28

What is the maximum throughput of gp2 volumes?

Answer 28

160MB/s

Question 29

How many IOPS for a gp2 volume size of 20GiB?

Answer 29

100 IOPS. Remember, while the formula is 3 IOPS per GiB of volume, the minimum IOPS is 100.

Question 30

What is the starting gp2 burst bucket credit balance?

Answer 30

5.4 million. This provides 3000 IOPS for 30 minutes

Question 31

How are gp2 burst credits earned?

Answer 31

3 IOPS per GiB of volume size

Question 32

What is the minimum io1 volume size?

Answer 32

4GiB

Question 33

What is the maximum io1 volume size?

Answer 33

16TiB

Question 34

What is the minimum IOPS for io1?

Answer 34

100

Question 35

What is the maximum IOPS for io1?

Answer 35

32,000

Question 36

How are IOPS determined in io1 volumes?

Answer 36

io1 IOPS is assigned by the user from 100 to 32,000

Question 37

How is the maximum IOPS for io1 volumes determined?

Answer 37

50 IOPS per GiB

Question 38

What is the smallest volume size required to achieve 32,000 IOPS in io1 volumes?

Answer 38

640 | 640 x 50 = 32,000

Question 39

What is the AWS recommended IOPS to GiB ratio?

Answer 39

> 2:1

Question 40

What is the maximum throughput of io1 volumes?

Answer 40

500MB/s

Question 41

What are the HDD volume types?

Answer 41

``` Throughput optimized (st1) Cold HDD (sc1) Magnetic ```

Question 42

Is st1 supported as boot device?

Answer 42

No

Question 43

Is sc1 supported as a boot device?

Answer 43

No

Question 44

What is the st1 volume type?

Answer 44

Throughput optimized

Question 45

What is the code for throughput optimized volumes?

Answer 45

st1

Question 46

Can you use magnetic storage as a boot device?

Answer 46

Yes

Question 47

What workloads are sc1 volumes ideal for?

Answer 47

infrequently accessed data. Low storage cost

Question 48

What is the max throughput of sc1 volumes?

Answer 48

250MB/s

Question 49

What workloads are st1 volumes ideal for?

Answer 49

frequently accessed and throughput intensive workloads

Question 50

What is the minimum st1 volume size?

Answer 50

500GB

Question 51

What is the maximum st1 volume size?

Answer 51

16TiB

Question 52

What is the ideal use case for magnetic volumes?

Answer 52

Where cost is a primary factor.

Question 53

What is the smallest volume size for magnetic volumes?

Answer 53

1GiB

Question 54

What is the largest volume size for magnetic volumes?

Answer 54

1TiB

Question 55

For st1 volumes, what is the ratio for throughput baseline?

Answer 55

40MB/s per TiB | Max throughput: 500MB/s

Question 56

For sc1 volumes, what is the ratio for throughput baseline?

Answer 56

12MB/s per TiB | Max throughput: 250MB/s