# TestCluster.StartAdditionalSiloAsync(bool)

[Type overview](/orleans/docs/api/csharp/microsoft.orleans.testinghost/orleans.testinghost.testcluster/) | [Methods](/orleans/docs/api/csharp/microsoft.orleans.testinghost/orleans.testinghost.testcluster/methods/)

[Source](https://github.com/dotnet/orleans/blob/e4e752cedecc2976811db49802c7a999b1f1c704/src/Orleans.TestingHost/TestCluster.cs#L509-L510)

```csharp
public Task<SiloHandle> StartAdditionalSiloAsync(bool startAdditionalSiloOnNewPort = false)
```

Start an additional silo, so that it joins the existing cluster.

### Parameters

- `startAdditionalSiloOnNewPort` (`bool`)

### Returns

SiloHandle for the newly started silo.