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ag-Learn AWS > AWS Reserved Instances > Flashcards

AWS Reserved Instances Flashcards

1
Q

What is a reserved instance?

A

In AWS you can reserve an instance and this gives you a guarantee this instance is available to you when you need it. You also get a discount.

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2
Q

Is a reserved instance a physical or virtual instance?

A

No, a reserved instance is a billing construct.

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3
Q

If I curches a c4 RI, and then provision a C4 instance, what will happen?

A

I will get a discount for the C4 instance I just launched because I previously reserved a C4 instance

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4
Q

I already have an on-demand T2 instance running in my AWS account, I purchase a T2 RI, what will happen?

A

The RI discount will be applied to my existing T2 on-demand instance

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5
Q

When you reserve an instance, what parameters do you need?

A

Payment option: no upfront, partial upfront, all upfront Term: 1 or 3 Offer class: standard and convertible Instance type: m4.large Scope: region or AZ Tenancy: shared or single tenancy Platform: Windows or Linux

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6
Q

Is there a limit on the number of RI I can purchase each month?

A

Yes, 20 per region and 20 per AZ

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7
Q

What is a standard reserved instance?

A

You can change the size, but the instance cannot be modified. You can not exchange the standard reserved instance, only modified it. You cna sell it.

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8
Q

Can I modify a reserved instance?

A

Yes, you can, but only in limited ways, - you can change size in the same family and still get a discount. -you can change

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9
Q

Are reserved instances only for EC2?

A

No, you can have reserved instance for, -Redshift -EC2 -RDS -Elastic cache -Dynamo DB

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10
Q

What it the typical range of discount for RI?

A

30 - 75%

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11
Q

Sould I be keeping in my mong the RI are one of the main tools to reduce cost?

A

Yes 100%, need to keep this in you mind.

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12
Q

When you purches an RI in a orgnization account, where is the RI applied first?

A

To the account where the RI was purchesed. If the RI can not be applied to the account, it will flow to other accounts in the orgnizatin.

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13
Q

Canb I restrict the RI to a single account?

A

Yes, but this means if it can not be used it wis forfit. This is done through orgnizations consolidated billing.

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14
Q

When I buy a RI and I gaurenteed a capacity reservation for my instance?

A

Yes 100%,, you are gaurenteed thta you will be able to start your instance in the account where the instance was purchesed.

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15
Q

What is a convertable RI?

A

Modifiable, you can change, -OS - Insnatannce - family Only a 3year term

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16
Q

What is a standard RI?

A

Not modifiable, 1 & 3 year term Upfront cash option -no upfront -partial -Full Can not change instance family Only linux instyance can be combiled or devided

17
Q

What is a regional RI?

A

With a regional RI I can use the RI in any of the regiona AZ’s. A regional RI can be a standared or convertable RI.

18
Q

What is a Redional convertable RI?

A

It is an RI thet is regional meaning it is applied to all AZ in the region.

19
Q

What is a AZ RI?

A

You are restriected to a AZ. This was the way it was before regional RI’s.

20
Q

I ant to take advantage of the cost saving of an REI and alos my app nbeed a gaurentee it will always have the capacity to launch, what is my bets options?

A

Use the less flexable AZ RI as it can get you a discount but also has the capacity reserivation. Regional RI do not come with a capacity reserivation.

21
Q

Do regional RI’s have a capacaity reserivation?

A

No.

22
Q

I have an orgniozation with consolidated billing ebnableds, when a buy an RI in an accountt will it flow to all other accounts?

A

Yes, the account is was purchesed in get first offer and then the RI flows to the other accounts.

23
Q

I have a convertable RI and I wnat to convert it to a smaler instyance size, is this possible?

A

No, instance size has to be equal or grater in size.

24
Q

What is a zonal RI?

A

This is where the RI I chsose (standared or convertable) is tied to a AZ.

25
Q

Witch of the RI’s gives you the most discount?

A

Standared - upto 75% Convertable - upto 54% Scheduled

26
Q

I am not 100% sure of the instance size I require to run my application, but I wnat to take advantage of RI to get the discount, what RI type am i bets to chose?

A

Use the convertable RI as I can change the instance size and type if needed.

27
Q

I have a standard RI and I need ot change the instance from M4 to c4, is this possible?

A

No, standard RI cna not change instance family.

28
Q

What is a scheduled RI?

A

This is where say every sunday I need an instance from 10am to 6pm, you can purchese this RI.

29
Q

I have a convertable RI, can I change the instance type form R3 to T2?

A

Yes

30
Q

I have a convertable RI, can I change the instance type form R3 to T2?

A

Yes

31
Q

I have a convertable RI, can I change the instance oS from windows to linux?

A

Yes

32
Q

I have a convertable RI, if AWS reduces rateof instance can I take advantage?

A

Yes

33
Q

I have a convertable RI, can I chnage instance size?

A

Yes

34
Q

What type of RI do i have to use to get a capacaity reservation?

A

Zonal, keep in mind zonal has its limits in thet the RI will only apply in the zone and not the region.

35
Q

What is the instance normalization factor?

A

Each instance is given a value called a normalization factor, it enables you to take instances that are smaller and say run two where you had one large one before. For example,

1 instance of c4,8xlarge I has a normalization of 64

1 instance of C4.4xlarge has a normalization factor of 32 so you cna run two again you RI.

36
Q

Can we move a reserved instance from one region to another?

A

No, you can only move inside the region for convertible RI’s

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