Eucalyptus includes an optional subscription-only component, the VMware Broker. The VMware Broker mediates all interaction between Eucalyptus and VMware infrastructure components (that is, ESX/ESXi, and vCenter).
Eucalyptus includes optional, subscription only support for integrating enterprise-grade SAN (Storage Area Network) hardware devices into a Eucalyptus cloud.
Availability Zone Support
Eucalyptus offers the ability to create multiple availability zones. In Eucalyptus, an availability zone is a partition in which there is at least one available cluster.
High Availability Support
Eucalyptus includes the ability to run redundant, hot-swappable instances for the CLC, Walrus, CC, SC, and VMware Broker components. In a high availability (HA) configuration, a failure of any single component will not cause the system to halt.