Hello,
There are various improvements on vCloud 5.1 if you compare it with vCloud 1.x.
What's New
- Elastic vDCs: Allocation Pool model vDCs that can span multiple clusters within a vCenter server allow more flexibility while efficiently using infrastructure resources as a tenant's compute needs grow over time.
- Change to the Allocation Pool model in 5.1.1 enables administrators to work around the maximum number of virtual machines on an organization VDC caused by the vCPU to MHz mapping parameter. This limit can now be worked around by setting a low vCPU to MHz mapping without CPU limiting virtual machines in the organization VDC.
- VXLAN: Using VXLAN, administrators can create multi-tenant L2/L3 networks that are faster to provision and require less reliance on physical network gear.
- Storage classes: Administrators can create multiple classes of storage capacity within the same provider/Org VDC thereby using their storage more effectively. vCloud Director can now leverage Storage DRS (with vSphere 5.1) for VMs provisioned through vCloud Director.
- Enhanced Org vDC creation workflow: Networking elements such as Edge Gateway creation, external networks connectivity, internal network creation, and 3rd party L4-7 networking and security services for the vDC can now be configured through the main Org vDC creation workflow, enabling customers to create Org vDCs complete with compute, storage, networking and security in less than 10 minutes.
- Networking Improvements: Each Org vDC is connected to the outside world through an Edge Gateway device, which supports self-service by the tenant, can have up to 10 network interfaces, supports multiple subnets on interfaces, can be configured in multiple sizes, supports High Availability in an active-passive configuration, supports DNS relay, enhanced Load Balancing, Firewall, and VPN. For information on using multiple subnets, seeConfiguring Multiple Subnets on External Networks.
- Integrated L4-7 networking and security solutions from 3rd party vendors: Using the vCloud Ecosystem Framework, customers can integrate 3rd party L4-7 networking and security services in their Org vDC. Such 3rd party solutions are available from selected vendors through the VMware Ready for Networking and Security program. This feature allows customers to leverage their existing technology investments in 3rd party vendors while leveraging automation and agility benefits of an integrated solution.
- API Extensibility Framework: Allows SP/ISV partners to extend vCloud API capabilities and add their own services to vCloud while leveraging infrastructure services from vCloud Director.
- Tenant and Admin Usability Improvements: Several improvements, including Web SSO for tenants, SSPI multi-factor authentication, snapshot support and easier troubleshooting for administrators.
For installation and configuration, check out below Document.
https://my.vmware.com/files/pdf/products/vCloud/VMware-vCloud-Director-51-Evaluation-Guide.pdf.
Also Look at the below KB:http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=2034092
Config Maximums vCloud 1.5 vs 5.1 : http://www.virtualizationexpress.com/2013/04/vcloud-director-maximums-15-51_7.html
Hope this helps.