# ListAllowedNodeTypeModifications
<a name="API_ListAllowedNodeTypeModifications"></a>

Lists all available node types that you can scale with your cluster's replication group's current node type.

When you use the `ModifyCacheCluster` or `ModifyReplicationGroup` operations to scale your cluster or replication group, the value of the `CacheNodeType` parameter must be one of the node types returned by this operation.

## Request Parameters
<a name="API_ListAllowedNodeTypeModifications_RequestParameters"></a>

 For information about the parameters that are common to all actions, see [Common Parameters](CommonParameters.md).

 ** CacheClusterId **   
The name of the cluster you want to scale up to a larger node instanced type. ElastiCache uses the cluster id to identify the current node type of this cluster and from that to create a list of node types you can scale up to.  
You must provide a value for either the `CacheClusterId` or the `ReplicationGroupId`.
Type: String  
Required: No

 ** ReplicationGroupId **   
The name of the replication group want to scale up to a larger node type. ElastiCache uses the replication group id to identify the current node type being used by this replication group, and from that to create a list of node types you can scale up to.  
You must provide a value for either the `CacheClusterId` or the `ReplicationGroupId`.
Type: String  
Required: No

## Response Elements
<a name="API_ListAllowedNodeTypeModifications_ResponseElements"></a>

The following elements are returned by the service.

 **ScaleDownModifications.member.N**   
A string list, each element of which specifies a cache node type which you can use to scale your cluster or replication group. When scaling down a Valkey or Redis OSS cluster or replication group using ModifyCacheCluster or ModifyReplicationGroup, use a value from this list for the CacheNodeType parameter.   
Type: Array of strings

 **ScaleUpModifications.member.N**   
A string list, each element of which specifies a cache node type which you can use to scale your cluster or replication group.  
When scaling up a Valkey or Redis OSS cluster or replication group using `ModifyCacheCluster` or `ModifyReplicationGroup`, use a value from this list for the `CacheNodeType` parameter.  
Type: Array of strings

## Errors
<a name="API_ListAllowedNodeTypeModifications_Errors"></a>

For information about the errors that are common to all actions, see [Common Error Types](CommonErrors.md).

 ** CacheClusterNotFound **   
The requested cluster ID does not refer to an existing cluster.  
HTTP Status Code: 404

 ** InvalidParameterCombination **   
Two or more incompatible parameters were specified.    
 ** message **   
Two or more parameters that must not be used together were used together.
HTTP Status Code: 400

 ** InvalidParameterValue **   
The value for a parameter is invalid.    
 ** message **   
A parameter value is invalid.
HTTP Status Code: 400

 ** ReplicationGroupNotFoundFault **   
The specified replication group does not exist.  
HTTP Status Code: 404

## Examples
<a name="API_ListAllowedNodeTypeModifications_Examples"></a>

### ListAllowedNodeTypeModifications for a Cluster
<a name="API_ListAllowedNodeTypeModifications_Example_1"></a>

The following example request a list of node types you can use to scale `myCluster` up.

#### Sample Request
<a name="API_ListAllowedNodeTypeModifications_Example_1_Request"></a>

```
https://elasticache.us-east-1.amazonaws.com/
   ?Action=ListAllowedNodeTypeModifications
   &CacheClusterId=mycachecluster
   &SignatureVersion=4
   &SignatureMethod=HmacSHA256
   &Version=2015-02-02
   &Timestamp=20150202T192317Z
   &X-Amz-Credential=<credential>
```

### ListAllowedNodeTypeModifications for a Replication Group
<a name="API_ListAllowedNodeTypeModifications_Example_2"></a>

The following example requests a list of node types you can use to scale `myReplGroup` up.

#### Sample Request
<a name="API_ListAllowedNodeTypeModifications_Example_2_Request"></a>

```
https://elasticache.us-east-1.amazonaws.com/
   ?Action=ListAllowedNodeTypeModifications
   &ReplicationGroupId=myreplgroup
   &SignatureVersion=4
   &SignatureMethod=HmacSHA256
   &Version=2015-02-02
   &Timestamp=20150202T192317Z
   &X-Amz-Credential=<credential>
```

## See Also
<a name="API_ListAllowedNodeTypeModifications_SeeAlso"></a>

For more information about using this API in one of the language-specific AWS SDKs, see the following:
+  [AWS Command Line Interface V2](https://docs.aws.amazon.com/goto/cli2/elasticache-2015-02-02/ListAllowedNodeTypeModifications) 
+  [AWS SDK for .NET V4](https://docs.aws.amazon.com/goto/DotNetSDKV4/elasticache-2015-02-02/ListAllowedNodeTypeModifications) 
+  [AWS SDK for C\+\+](https://docs.aws.amazon.com/goto/SdkForCpp/elasticache-2015-02-02/ListAllowedNodeTypeModifications) 
+  [AWS SDK for Go v2](https://docs.aws.amazon.com/goto/SdkForGoV2/elasticache-2015-02-02/ListAllowedNodeTypeModifications) 
+  [AWS SDK for Java V2](https://docs.aws.amazon.com/goto/SdkForJavaV2/elasticache-2015-02-02/ListAllowedNodeTypeModifications) 
+  [AWS SDK for JavaScript V3](https://docs.aws.amazon.com/goto/SdkForJavaScriptV3/elasticache-2015-02-02/ListAllowedNodeTypeModifications) 
+  [AWS SDK for Kotlin](https://docs.aws.amazon.com/goto/SdkForKotlin/elasticache-2015-02-02/ListAllowedNodeTypeModifications) 
+  [AWS SDK for PHP V3](https://docs.aws.amazon.com/goto/SdkForPHPV3/elasticache-2015-02-02/ListAllowedNodeTypeModifications) 
+  [AWS SDK for Python (Boto3)](https://docs.aws.amazon.com/goto/boto3/elasticache-2015-02-02/ListAllowedNodeTypeModifications) 
+  [AWS SDK for Ruby V3](https://docs.aws.amazon.com/goto/SdkForRubyV3/elasticache-2015-02-02/ListAllowedNodeTypeModifications)