Select a mirror server host with the following characteristics:
- This server runs on either CentOS (v5.x, v6.x) or RHEL (v5.x, v6.x) and has several GB of storage available. 
- This server and the cluster nodes are all running the same OS. ![[Note]](../common/images/admon/note.png) - Note - To support repository mirroring for heterogeneous clusters requires a more complex procedure than the one documented here. 
- The firewall allows all cluster nodes (the servers on which you want to install HDP) to access this server. 


