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# AWS::EMR::Cluster EbsBlockDeviceConfig
<a name="aws-properties-emr-cluster-ebsblockdeviceconfig"></a>

`EbsBlockDeviceConfig` is a subproperty of the `EbsConfiguration` property type. `EbsBlockDeviceConfig` defines the number and type of EBS volumes to associate with all EC2 instances in an EMR cluster.

## Syntax
<a name="aws-properties-emr-cluster-ebsblockdeviceconfig-syntax"></a>

To declare this entity in your CloudFormation template, use the following syntax:

### JSON
<a name="aws-properties-emr-cluster-ebsblockdeviceconfig-syntax.json"></a>

```
{
  "[VolumeSpecification](#cfn-emr-cluster-ebsblockdeviceconfig-volumespecification)" : VolumeSpecification,
  "[VolumesPerInstance](#cfn-emr-cluster-ebsblockdeviceconfig-volumesperinstance)" : Integer
}
```

### YAML
<a name="aws-properties-emr-cluster-ebsblockdeviceconfig-syntax.yaml"></a>

```
  [VolumeSpecification](#cfn-emr-cluster-ebsblockdeviceconfig-volumespecification): 
    VolumeSpecification
  [VolumesPerInstance](#cfn-emr-cluster-ebsblockdeviceconfig-volumesperinstance): Integer
```

## Properties
<a name="aws-properties-emr-cluster-ebsblockdeviceconfig-properties"></a>

`VolumeSpecification`  <a name="cfn-emr-cluster-ebsblockdeviceconfig-volumespecification"></a>
EBS volume specifications such as volume type, IOPS, size (GiB) and throughput (MiB/s) that are requested for the EBS volume attached to an Amazon EC2 instance in the cluster.  
*Required*: Yes  
*Type*: [VolumeSpecification](aws-properties-emr-cluster-volumespecification.md)  
*Update requires*: [No interruption](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-no-interrupt)

`VolumesPerInstance`  <a name="cfn-emr-cluster-ebsblockdeviceconfig-volumesperinstance"></a>
Number of EBS volumes with a specific volume configuration that are associated with every instance in the instance group  
*Required*: No  
*Type*: Integer  
*Update requires*: [No interruption](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-no-interrupt)