# STENG, clusters and servers

The **STENG, Clusters and Servers** interface provides a centralized view for managing clusters, STENG components, and associated servers. Here, administrators can configure clusters, monitor server activity, and manage communication protocols. It also offers quick access to general statistics, helping you track the number of active clusters, STENGs, and servers at a glance.

The **STENG** (Scalable Trusted Engine) is the execution agent of Data One. It performs executive tasks orchestrated by the CEMAN, such as file transfers, data compression, and data encryption. Among its activities, it can act as a server for users to upload and download files, or as a client to push and pull files from remote servers.

A **STENG cluster** is a group of cooperative STENG peers. Having a cluster ensures high availability and enables tasks to be executed in parallel.

Navigate to **Setup** → **STENG, Clusters, and Servers** to view all clusters in the system, the STENGs associated with each cluster, and all servers in each STENG.

<figure><img src="/files/9t2rWmdXsmzwtkSxlfX0" alt=""><figcaption></figcaption></figure>

The top section displays the list of configured clusters (e.g., *cluster1*, *cluster2*, c*luster3*) and provides an option to **Add a cluster**. Each cluster tile indicates its status (active or inactive) and the number of STENGs associated.

On the left, a panel shows details for the selected cluster, including:

* **Peer information** (e.g., *peer1*).
* Number of active servers (e.g., *10/12 active servers*).
* Host name/address (e.g., *steng-p1*).
* Associated DMZ cluster (e.g., *DMZC1*).

Protocol categories and associated servers are shown in the central panel:

* A specific tab is dedicated to each protocol type: **Common Protocols**, **Primeur Protocols**, **Cloud Protocols**, and **Third Party**.&#x20;
* Each protocol card shows the protocol name (e.g., *ftp-server*, *https-server*), type, and DMZ port number. Green indicators denote active status.

You can add a new STENG clicking the **Add STENG** button. See the [Add a STENG to a cluster](/data-mover-1.21/infrastructure/steng-clusters-and-servers/add-a-cluster.md) section for details.&#x20;

The **General Statistics** panel on the right summarizes the configuration:

* Total clusters linked to the STENG (e.g., *3 Clusters*). . If a cluster's box is grey, its status is unknown.
* Number of STENGs and servers, with active/inactive status (e.g., *1 STENG active*, *12 servers, 10 active*).

When you select a server, a card appears in the top-right corner displaying its details. The card indicates whether the server is running and includes two buttons to start or stop the server as needed.

<figure><img src="/files/xiUjCXjb1f1NypXaTeLv" alt=""><figcaption></figcaption></figure>

The **Stop** action stops the STENG at function level but the JVM remains active.

To see the full list of Servers in a separate window, you can click the **View All** button.

{% hint style="info" %}
Clusters, CEMAN and STENG must always be odd and must be at least 3 (each).
{% endhint %}

{% hint style="info" %}
When you delete a STENG, all the servers configured on that STENG will be deleted as well without further notice!
{% endhint %}


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