摘自：http://dev.mysql.com/doc/refman/5.1/en/ha-overview.html
mysql網站提供的mysql 複製，drbd， mysql cluster和Oracle VM Template HA方案的比較
Table 15.1. Feature Comparison of MySQL HA Solutions
| Requirement | MySQL Replication | DRBD | Oracle VM Template | MySQL Cluster |
|---|---|---|---|---|
| Availability | ||||
| Platform Support | All Supported by MySQL Server | Linux | Oracle Linux | AllSupported by MySQL Cluster |
| Automated IP Failover | No | Yes | Yes | Depends on Connector and Configuration |
| Automated Database Failover | No | Yes | Yes | Yes |
| Automatic Data Resynchronization | No | Yes | N/A - Shared Storage | Yes |
| Typical Failover Time | User / Script Dependent | Configuration Dependent, 60 seconds and Above | Configuration Dependent, 60 seconds and Above | 1 Second and Less |
| Synchronous Replication | No, Asynchronous and Semisynchronous | Yes | N/A - Shared Storage | Yes |
| Shared Storage | No, Distributed | No, Distributed | Yes | No, Distributed |
| Geographic redundancy support | Yes | Yes, via MySQL Replication | Yes, via MySQL Replication | Yes, via MySQL Replication |
| Update Schema On-Line | No | No | No | Yes |
| Scalability | ||||
| Number of Nodes | One Master, Multiple Slaves | One Active (primary), one Passive (secondary) Node | One Active (primary), one Passive (secondary) Node | 255 |
| Built-in Load Balancing | Reads, via MySQL Replication | Reads, via MySQL Replication | Reads, via MySQL Replication & During Failover | Yes, Reads and Writes |
| Supports Read-Intensive Workloads | Yes | Yes | Yes | Yes |
| Supports Write-Intensive Workloads | Yes, via Application-Level Sharding | Yes, via Application-Level Sharding to Multiple Active/Passive Pairs | Yes, via Application-Level Sharding to Multiple Active/Passive Pairs | Yes, via Auto-Sharding |
| Scale On-Line (add nodes, repartition, etc.) | No | No | No | Yes |