# AWS CloudHSM configure tool
<a name="configure-tool"></a>

AWS CloudHSM automatically synchronizes data among all hardware security modules (HSM) in a cluster. The **configure** tool updates the HSM data in the configuration files that the synchronization mechanisms use. Use **configure** to refresh the HSM data before you use the command line tools, especially when the HSMs in the cluster have changed.

 AWS CloudHSM includes two major Client SDK versions: 
+ Client SDK 5: This is our latest and default Client SDK. For information on the benefits and advantages it provides, see [Benefits of AWS CloudHSM Client SDK 5](client-sdk-5-benefits.md).
+ Client SDK 3: This is our older Client SDK. It includes a full set of components for platform and language-based applications compatibility and management tools.

For instructions on migrating from Client SDK 3 to Client SDK 5, see [Migrating from AWS CloudHSM Client SDK 3 to Client SDK 5](client-sdk-migration.md).

**Topics**
+ [Client SDK 5 configure tool](configure-sdk-5.md)
+ [Client SDK 3 configure tool](configure-sdk-3.md)