A separate Site Recovery Manager instance is required for the protection and recovery of management components in the event of a disaster situation with your SDDC.

Install and configure Site Recovery Manager after you install and configure vCenter Server and the Platform Services Controller in the region. Site Recovery Manager is a business continuity and disaster recovery solution that helps you to plan, test, and run the recovery of the management virtual machines with the VMware Validated Design, providing protection and orchestrated failover between the Region A and Region B vCenter Server sites.

You have the following options for deployment and pairing of vCenter Server and Site Recovery Manager:

  • vCenter Server options

    • You can use Site Recovery Manager and vSphere Replication with vCenter Server Appliance or with vCenter Server for Windows. 

    • You can deploy a vCenter Server Appliance in one region and a vCenter Server for Windows instance in the other region. 

  • Site Recovery Manager options

    • You can use either a physical system or a virtual system.

    • You can deploy Site Recovery Manager on a shared system, such as the system of vCenter Server for Windows, or on a dedicated system.

Table 1. Design Decisions about Site Recovery Manager and vSphere Replication Deployment

Decision ID

Design Decision

Design Justification

Design Implication


Deploy Site Recovery Manager in a dedicated virtual machine.

All components of the SDDC solution must support the highest levels of availability. When Site Recovery Manager runs as a virtual machine, you can enable the availability capabilities of vCenter Server clusters.

Requires a Microsoft Windows server license.


Deploy each Site Recovery Manager instance in the management cluster.

All management components must be in the same cluster.



Deploy each Site Recovery Manager instance with an embedded PostgreSQL database.

  • Reduce the dependence on external components.

  • Reduce potential database licensing costs.

Requires assigning database administrators who have the skills and tools to administer PostgreSQL databases.


Deploy each Site Recovery Manager instance with trusted certificates.

Similarly to vCenter Server, Site Recovery Manager must use trusted CA-signed certificates.

Replacing the default certificates with trusted CA-signed certificates complicates installation and configuration.

Sizing Compute Resources for Site Recovery Manager

You must size the host operating system on which the Site Recovery Manager software runs to support the orchestrated failover of the SDDC management components according to the objectives of this design.

Table 2. Compute Resources for a Site Recovery Manager Node



Number of vCPUs

2 (running at 2.0 GHz or higher)


4 GB

Number of virtual machine NIC ports


Number of disks


Disk size

40 GB

Operating system

Windows Server 2012 R2

Sizing is usually done according to IT organization requirements. However, this design uses calculations that are based on the management components in a single region. The design then mirrors the calculations for the other region. Consider the following management node configuration per region:

Table 3. SDDC Nodes with Failover Support

Management Component

Node Type

Number of Nodes

Cloud Management Platform

vRealize Automation Appliance


vRealize IaaS Web Server


vRealize IaaS Management Server


vRealize IaaS DEM


Microsoft SQL Server


vRealize Business for Cloud Appliance


vRealize Operations Manager

vRealize Operations Manager Master


vRealize Operations Manager Master Replica


vRealize Operations Manager Data


You must protect a total of 13 virtual machines. You use vSphere Replication as the replication solution between the Site Recovery Manager sites, and you distribute the virtual machines in two protection groups.

Table 4. Compute Resources for the Site Recovery Manager Nodes Design Decisions

Decision ID

Design Decision

Design Justification

Design Implication


Deploy Site Recovery Manager on a Microsoft Windows Server host OS according to the following specifications:

  • 2 vCPUs

  • 4 GB memory

  • 40 GB disk

  • 1 GbE

Accommodate the protection of management components to supply the highest levels of availability. This size further accommodates the following setup:

You must increase the size of the nodes if you add more protection groups, virtual machines to protect or recovery plans.


Use vSphere Replication in Site Recovery Manager as the protection method for virtual machine replication.

Enable replication in a vSAN environment where you cannot configure array-based replication.