Data | 
| Member name | Value | Description | 
|---|---|---|
| None | 0 | The name server doesn't have any tasks for the data server to perform. | 
| ReportBlocks | 1 | The name server wants the data server to send a full list of all its blocks. | 
| DeleteBlocks | 2 | The name server wants the data server to delete certain blocks. | 
| ReplicateBlock | 3 | The name server wants the data server to replicate a block to a different data server. | 
| SendInitialData | 4 | The name server doesn't know this data server and needs an initial data heartbeat to verify the file system ID. |