# Setting your rightsizing recommendation preferences
<a name="rightsizing-preferences-process"></a>

This section provides you with instructions on how to set your rightsizing recommendation preferences in AWS Compute Optimizer.

## Procedure
<a name="rightsizing-preferences-procedure"></a>

**Topics**
+ [Step 1: Set preference level (Organizations only)](#rightsizing-preference-level)
+ [Step 2: Set regional scope](#rightsizing-preferences-regions)
+ [Step 3: Specify preferred EC2 instances](#rightsizing-preferences-preferred-resources-process)
+ [Step 4: Specify lookback period and metrics](#rightsizing-preferences-lookback-metrics-process)

### Step 1: Set preference level (Organizations only)
<a name="rightsizing-preference-level"></a>

If you're the account manager or the delegated administrator of your organization, you can choose all the accounts in an organization or specific accounts to which you want to apply rightsizing recommendation preferences. 

**Note**  
If you’re an individual AWS account holder, skip to [Step2: Regional scope](https://docs.aws.amazon.com/compute-optimizer/latest/ug/rightsizing-preferences.html#rightsizing-preferences-regions).<a name="rightsizing-step-1"></a>

**To set the preference level for your rightsizing recommendation preferences**

1. Open the Compute Optimizer console at [https://console.aws.amazon.com/compute-optimizer/](https://console.aws.amazon.com/compute-optimizer/).

1. Choose **Rightsizing** in the navigation pane.

1. Choose the resource type you want from the **Resource type** dropdown menu.

1. In your chosen resource section, choose the ** All opted-in accounts** dropdown menu.
   + To opt in all member accounts, choose **All opted-in accounts** from the Preference level dropdown. 
   + To opt in an individual member account, choose **Choose account** from the Preference level dropdown. In the prompt that appears, select the account you want to opt in for rightsizing preferences. Then, choose **Set account level**.  
![\[Choose the account for rightsizing recommendation preferences\]](http://docs.aws.amazon.com/compute-optimizer/latest/ug/images/rightsizing-preference-level.png)

### Step 2: Set regional scope
<a name="rightsizing-preferences-regions"></a>

In this step you can specify the AWS Regions where you want Compute Optimizer to apply your rightsizing recommendation preferences. For example, if you select the US East (N. Virginia) Region and US East (Ohio) Region, we only apply the preferences to those Regions.<a name="rightsizing-step-2"></a>

**To set the regional scope of your rightsizing recommendation preferences**

1. Open the Compute Optimizer console at [https://console.aws.amazon.com/compute-optimizer/](https://console.aws.amazon.com/compute-optimizer/).

1. Choose **Rightsizing** in the navigation pane.

1. Choose the resource type you want from the **Resource type** dropdown menu.

1. On the **Rightsizing preferences** page, choose **Edit**.

1. Choose either **Any Region** or **Custom Regions** based on your requirements.

1. If you choose **Custom Regions**, select the AWS Regions where you want Compute Optimizer to apply your preferences. Then, choose **Next**.  
![\[Choose the Regions for rightsizing recommendation preferences\]](http://docs.aws.amazon.com/compute-optimizer/latest/ug/images/rightsizing-regions.png)

### Step 3: Specify preferred EC2 instances
<a name="rightsizing-preferences-preferred-resources-process"></a>

Use the following procedure to specify your preferred instance types and sizes for member accounts of an organization or an individual AWS account holder.<a name="rightsizing-step-3"></a>

**To set the instances you want in your recommendation output**

1. Follow the steps outlined in [Step2: Regional scope](https://docs.aws.amazon.com/compute-optimizer/latest/ug/rightsizing-preferences.html#rightsizing-preferences-regions).

1. On the **Preferred EC2 instances** page, choose either **Any instance type** (default) or **Limit to specific instance types and sizes** based on your requirements.

1. If you choose **Limit to specific instance types and sizes**, select the instance types you want in your recommendation output.
   + Use the **Search by instance families** dropdown menu. When you select any of the instance families, the list only displays the available instance types within those families that you selected.
   + Use the **Find instance types** search bar to enter the specific instance types you want.  
![\[Choose the preferred instances for rightsizing recommendation preferences\]](http://docs.aws.amazon.com/compute-optimizer/latest/ug/images/rightsizing-all-instances.png)

1. (Optional) To specify the sizes of each instance type, do the following:

   1. Choose the edit icon on the instance type you want.

   1. Select **X** on the instance sizes that you don’t want.

   1. Select **✔** to confirm your selections.

1. (Optional) If you don't want Compute Optimizer to automatically consider future variations of your chosen instance families, turn off **Automatically consider future variations of the instance families selected**.  
![\[Automatically consider future variations of the instance families toggle\]](http://docs.aws.amazon.com/compute-optimizer/latest/ug/images/rightsizing-future-instances.png)

1. Choose **Next**.

### Step 4: Specify lookback period and metrics
<a name="rightsizing-preferences-lookback-metrics-process"></a>

Use the following procedure to specify the lookback period, and the CPU and memory utilization preferences you want Compute Optimizer to use when generating your custom recommendations.<a name="rightsizing-step-4"></a>

**To set the lookback period, and CPU and memory preferences**

1. Follow the steps outlined in [Step 4: Preferred EC2 instances](https://docs.aws.amazon.com/compute-optimizer/latest/ug/rightsizing-preferences.html#preferred-resources-steps).

1. On the **Lookback period and metrics** page, choose a lookback period option based on your requirements.
   + If you want to use the 93-day lookback period (paid feature), you need to enable the enhanced infrastructure metrics preference. To do this, choose **Enable enhanced infrastructure metrics**. Then, in the prompt that appears, choose **Enable enhanced infrastructure metrics**.
   + If the enhanced infrastructure metrics preference is already enabled and you want to choose a 14-day or 32-day lookback period, you need to disable the enhanced infrastructure metrics preference. To do this, choose **Disable enhanced infrastructure metrics**. Then, in the prompt that appears, choose **Disable enhanced infrastructure metrics**.

1. Choose a utilization preset: **Max savings**, **Balanced**, **Default**, or **Max performance**.

   Alternatively, you can customize your own specific CPU and memory utilization preferences.  
![\[Choose from preset options\]](http://docs.aws.amazon.com/compute-optimizer/latest/ug/images/rightsizing-custom-configuration.png)

1. Choose **Next**.

1. On the **Review and save** page, review all the preferences you have set. Then, choose **Save preferences**.

Within 24 hours your new recommendations start to appear with the rightsizing preferences that you set.