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AWS Certified SysOps Associate > Monitoring and Metrics > Flashcards

Monitoring and Metrics Flashcards

1
Q

Largest EBS size

A

16TiB

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2
Q

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

A

1

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3
Q

What format does EBS use?

A

Raw, unformatted. Must be managed by OS

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4
Q

True or false: UBS supports RAID

A

True, as long as the OS supports RAID

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5
Q

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

A

True.

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6
Q

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

A

The volume will persist.

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7
Q

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

A

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

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8
Q

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

A

uncheck, or unflag the DeleteOnTermination option

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9
Q

Where are EBS snapshots stored?

A

S3

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10
Q

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

A

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

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11
Q

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

A

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

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12
Q

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

A

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

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13
Q

SSD - IOPS standard size

A

256kb I/O size

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14
Q

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

A

4

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15
Q

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

A

1

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16
Q

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

A
  1. Random operations cannot be grouped together and will each be counted as an IOPS.
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17
Q

What is a burst bucket?

A

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

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18
Q

How are bursts allocated?

A

Through burst credits

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19
Q

How are burst credits earned?

A

Volumes earn burst credits over time and depend on volume type

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20
Q

True or false: Volumes can earn unlimited credits?

A

False: They are limited.

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21
Q

Under what metric is the burst credits reported in CloudWatch?

A

BurstBalance metric

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22
Q

What is the minimum gp2 SSD volume size?

A

1GiB

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23
Q

What is the maximum gp2 SSD volume size?

A

16TiB

24
Q

What is the minimum gp2 IOPS

A

100 IOPS

25
Q

What are the two SSD volume types?

A

GP2 - General Purpose

io1 - Provisioned IOPS

26
Q

What is the maximum gp2 IOPS

A

10,000 IOPS

27
Q

How is the maximum IOPS for gp2 volumes determined?

A

3 IOPS per 1 GiB of volume size

ex. 100GiB volume = 300 IOPS

28
Q

What is the maximum throughput of gp2 volumes?

A

160MB/s

29
Q

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

A

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

30
Q

What is the starting gp2 burst bucket credit balance?

A

5.4 million. This provides 3000 IOPS for 30 minutes

31
Q

How are gp2 burst credits earned?

A

3 IOPS per GiB of volume size

32
Q

What is the minimum io1 volume size?

A

4GiB

33
Q

What is the maximum io1 volume size?

A

16TiB

34
Q

What is the minimum IOPS for io1?

A

100

35
Q

What is the maximum IOPS for io1?

A

32,000

36
Q

How are IOPS determined in io1 volumes?

A

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

37
Q

How is the maximum IOPS for io1 volumes determined?

A

50 IOPS per GiB

38
Q

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

A

640

640 x 50 = 32,000

39
Q

What is the AWS recommended IOPS to GiB ratio?

A

> 2:1

40
Q

What is the maximum throughput of io1 volumes?

A

500MB/s

41
Q

What are the HDD volume types?

A 
Throughput optimized (st1)
Cold HDD (sc1)
Magnetic
42
Q

Is st1 supported as boot device?

A

No

43
Q

Is sc1 supported as a boot device?

A

No

44
Q

What is the st1 volume type?

A

Throughput optimized

45
Q

What is the code for throughput optimized volumes?

A

st1

46
Q

Can you use magnetic storage as a boot device?

A

Yes

47
Q

What workloads are sc1 volumes ideal for?

A

infrequently accessed data. Low storage cost

48
Q

What is the max throughput of sc1 volumes?

A

250MB/s

49
Q

What workloads are st1 volumes ideal for?

A

frequently accessed and throughput intensive workloads

50
Q

What is the minimum st1 volume size?

A

500GB

51
Q

What is the maximum st1 volume size?

A

16TiB

52
Q

What is the ideal use case for magnetic volumes?

A

Where cost is a primary factor.

53
Q

What is the smallest volume size for magnetic volumes?

A

1GiB

54
Q

What is the largest volume size for magnetic volumes?

A

1TiB

55
Q

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

A

40MB/s per TiB

Max throughput: 500MB/s

56
Q

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

A

12MB/s per TiB

Max throughput: 250MB/s

AWS Certified SysOps Associate (3 decks)

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