Comparing VMware VSA & VMware Virtual SAN
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
DescriptionLow cost, simple shared storage for small deploymentsScale-out distributed storage designed for virtualized/cloud environmentsForm factorVirtual ApplianceBuilt-in vSphere kernelIdeal TargetsSmall SMB
ROBO deployments
Enterprise
Commercial
Scalability2 to 3 vSphere servers
Does not scale beyond 3 hosts
Minimum 3 hosts deployments
Scale out to vSphere cluster size
PerformanceNo SSD (low performance)SSD caching (high performance)FunctionalitySimple 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，
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