Enterprise Cloud Features 

  Eucalyptus 2 Eucalyptus 3
Features
Amazon AWS Interface Compatibility
Bucket-Based Storage Abstraction (AWS S3-Compatible)
Elastic Block-Based Storage Abstraction (AWS EBS-Compatible)
Local Block Storage Abstraction (Ephemeral)
Elastic Resource Orchestration and Management (Placement, Addition, and Removal)
User Group and Role-Based Access Management
Flexible Clustering and Zoning (Multi-Cluster)
Flexible Network Management, Security Groups, Traffic Isolation (4 Networking Modes)
Image Management (AWS S3-Backed)
Open Source Xen and KVM Hypervisor Support
Heterogeneous Linux Guest OS Support
Resource Reporting and Accounting √*
Microsoft Windows Guest OS Support √*
VMware Hypervisor Support (ESX, ESXi, vSphere) √* √*
Image Conversion for VMware √* √*
SAN Adapter for Elastic Block Storage (AWS EBS) √* √*
NetApp SAN Adapter   √*
High Availability for Eucalyptus Components  
Identity Access Management (AWS IAM-Compatible)  
LDAP and Active Directory Integration  
Enhanced Accounting and Reporting Support  
Resource Policies and Quotas  
Image Managment (AWS EBS-Backed, Boot from EBS)  

* Not available in Eucalyptus Open Source