# ClusterMembershipOptions.DefunctSiloMinimumRetention

[Type overview](/orleans/docs/api/csharp/microsoft.orleans.core/orleans.configuration.clustermembershipoptions/) | [Properties](/orleans/docs/api/csharp/microsoft.orleans.core/orleans.configuration.clustermembershipoptions/properties/)

[Source](https://github.com/dotnet/orleans/blob/997f2589e814db85c6a451b59c081c88e50b8944/src/Orleans.Core/Configuration/Options/ClusterMembershipOptions.cs)

```csharp
public TimeSpan DefunctSiloMinimumRetention
```

Gets or sets the minimum period for which dead silo entries are retained in the membership table. Cleanup removes only dead entries whose latest startup, liveness, or suspect-vote timestamp is older than this period, regardless of [ClusterMembershipOptions](/orleans/docs/api/csharp/microsoft.orleans.core/orleans.configuration.clustermembershipoptions/) and [ClusterMembershipOptions](/orleans/docs/api/csharp/microsoft.orleans.core/orleans.configuration.clustermembershipoptions/). Retaining recent dead entries lets a silo whose membership operations are delayed or retried, such as a joining silo within [ClusterMembershipOptions](/orleans/docs/api/csharp/microsoft.orleans.core/orleans.configuration.clustermembershipoptions/), observe that it was declared dead. This period should comfortably exceed [ClusterMembershipOptions](/orleans/docs/api/csharp/microsoft.orleans.core/orleans.configuration.clustermembershipoptions/) and expected clock skew between silos.

### Value

Dead silo entries are retained for at least one hour by default.