As a best practice, you must deploy a highly available NSX Manager instance so that the NSX central control plane can continue propagating configuration to the transport nodes. You also select an NSX Manager appliance size according to the number of ESXi hosts required to run the management components in VMware Cloud Foundation.

Deployment Type

You can deploy NSX Manager in a one-node configuration or as a three-node cluster for high availability.

Table 1. Design Decisions on the NSX Manager Deployment Type

Decision ID

Design Decision

Design Justification

Design Implication

VCF-MGMT-NSX-CFG-001

Deploy three NSX Manager nodes in the default vSphere cluster in the management domain for configuring and managing the network services for the management domain.

The management components can be placed on isolated virtual networks, using load balancing, logical switching, dynamic routing, and logical firewalls services.

  • You must turn on vSphere HA in the default cluster in the management domain.

  • The default management cluster requires four physical ESXi hosts for vSphere HA and for high availability of the NSX Manager cluster.

Sizing Compute and Storage Resources for NSX Manager

When you size the resources for the management components in an NSX-T Data Center deployment, consider the compute and storage requirements for each component, and the number of nodes per component type.

Table 2. NSX Manager Resource Specification

Appliance Size

vCPU

Memory (GB)

Storage (GB)

Scale

Extra-Small

2

8

300

Cloud Service Manager only

Small

4

16

300

Proof of concept

Medium

6

24

300

Up to 64 ESXi hosts

Large

12

48

300

More than 64 ESXi hosts

Table 3. Design Decisions on Sizing Resources for NSX Manager

Decision ID

Design Decision

Design Justification

Design Implication

VCF-MGMT-NSX-CFG-002

Deploy each node in the NSX Manager cluster for the management domain as a medium-size appliance or larger.

A medium-size appliance is sufficient for providing network services to the management domain components.

If you extend the management domain, increasing the size of the NSX Manager appliances might be required.

High Availability of NSX Manager for a Single VMware Cloud Foundation Instance

The NSX Manager cluster runs on the default management vSphere cluster. vSphere HA protects the NSX Manager appliances by restarting an NSX Manager appliance on a different ESXi host if a primary ESXi host failure occurs.

Table 4. Design Decisions on High Availability for NSX Manager

Decision ID

Design Decision

Design Justification

Design Implication

VCF-MGMT-NSX-CFG-003

Create a virtual IP (VIP) address for the NSX Manager cluster for the management domain.

Provides high availability of the user interface and API of NSX Manager.

  • The VIP address feature provides high availability only. It does not load-balance requests across the cluster.

  • When using the VIP address feature, all NSX Manager nodes must be deployed on the same Layer 2 network.

VCF-MGMT-NSX-CFG-004

Apply VM-VM anti-affinity rules in vSphere Distributed Resource Scheduler (vSphere DRS) to the NSX Manager appliances.

Keeps the NSX Manager appliances running on different ESXi hosts for high availability.

  • You must allocate at least four physical hosts so that the three NSX Manager appliances continue running if an ESXi host failure occurs.

VCF-MGMT-NSX-CFG-005

In vSphere HA, set the restart priority policy for each NSX Manager appliance to high.

  • NSX Manager implements the control plane for virtual network segments. vSphere HA restarts the NSX Manager appliances first so that other virtual machines that are being powered on or migrated by using vSphere vMotion while the control plane is offline lose connectivity only until the control plane quorum is re-established.

  • Setting the restart priority to high reserves the highest priority for flexibility for adding services that must be started before NSX Manager.

If the restart priority for another management appliance is set to highest, the connectivity delay for management appliances will be longer.

High Availability of NSX Manager for a Single VMware Cloud Foundation Instance with Multiple Availability Zones

The NSX Manager cluster runs in the first availability zone. If a failure in this zone occurs, the NSX Manager cluster is failed over to the second availability zone.

Table 5. Design Decisions on High Availability for NSX Manager for a Single VMware Cloud Foundation Instance with Multiple Availability Zones

Decision ID

Design Decision

Design Justification

Design Implication

VCF-MGMT-NSX-CFG-006

Add the NSX Manager appliances to the virtual machine group for the first availability zone.

Ensures that, by default, the NSX Manager appliances are powered on on a host in the primary availability zone.

None.