# InProcessTestCluster.StartAdditionalSiloAsync(bool)

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

[Source](https://github.com/dotnet/orleans/blob/e4e752cedecc2976811db49802c7a999b1f1c704/src/Orleans.TestingHost/InProcTestCluster.cs)

```csharp
public Task<InProcessSiloHandle> StartAdditionalSiloAsync(bool startAdditionalSiloOnNewPort)
```

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

### Parameters

- `startAdditionalSiloOnNewPort` (`bool`)

### Returns

SiloHandle for the newly started silo.