# TestCluster.StartAdditionalSilosAsync(int, 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#L520-L548)

```csharp
public Task<List<SiloHandle>> StartAdditionalSilosAsync(int silosToStart, bool startAdditionalSiloOnNewPort = false)
```

Start a number of additional silo, so that they join the existing cluster.

### Parameters

- `silosToStart` (`int`): Number of silos to start.
- `startAdditionalSiloOnNewPort` (`bool`)

### Returns

List of SiloHandles for the newly started silos.