| Version being Installed | Oldest Compatible Version |
|---|---|
| Pacemaker 1.0.x | Pacemaker 1.0.0 |
| Pacemaker 0.7.x | Pacemaker 0.6 or Heartbeat 2.1.3 |
| Pacemaker 0.6.x | Heartbeat 2.0.8 |
| Heartbeat 2.1.3 (or less) | Heartbeat 2.0.4 |
| Heartbeat 2.0.4 (or less) | Heartbeat 2.0.0 |
| Heartbeat 2.0.0 | None. Use an alternate upgrade strategy. |