Comparing VMware VSA & VMware Virtual SAN
在VMware官方发布Virtual SAN （VSAN）公开测试版不久，目前为止产生了很多对其的问题，许多人对vSphere Storage Appliance (VSA) and Virtual SAN (VSAN)之间的概念产生了混淆，故特此在此对两个解决方案进行差异对比。
也许两者在概念中有部分相似处，但是他们本质上具有很多不同
Attributes | vSphere Storage Appliance | VMware Virtual SAN |
| Description | Low cost, simple shared storage for small deployments | Scale-out distributed storage designed for virtualized/cloud environments |
| Form factor | Virtual Appliance | Built-in vSphere kernel |
| Ideal Targets | Small SMB ROBO deployments | Enterprise Commercial |
| Scalability | 2 to 3 vSphere servers Does not scale beyond 3 hosts | Minimum 3 hosts deployments Scale out to vSphere cluster size |
| Performance | No SSD (low performance) | SSD caching (high performance) |
| Functionality | Simple install & configure Scales up to ~16TB usable storage | vCenter-integrated management SSD caching and intelligent data placement Rapid storage provisioning Scale-out for large deployments Granular scaling Storage policy based management |
希望以上简单对比能对两者进行更好的区分，
