Tutorial: Scale clusters in a private cloud

To get the most out of your Azure VMware Solution private cloud experience, scale the clusters and hosts to reflect what you need for planned workloads. You can scale the clusters and hosts in a private cloud as required for your application workload. You should address performance and availability limitations for specific services on a case-by-case basis.

The following table describes the maximum limits for Azure VMware Solution.

Resource Limit
vSphere clusters per private cloud 12
Minimum number of ESXi hosts per cluster 3 (hard-limit)
Maximum number of ESXi hosts per cluster 16 (hard-limit)
Maximum number of ESXi hosts per private cloud 96
Maximum number of vCenter Servers per private cloud 1 (hard-limit)
Maximum number of HCX site pairings 25 (any edition)
Maximum number of HCX service meshes 10 (any edition)
Maximum number of Azure VMware Solution ExpressRoute linked private clouds from a single location to a single Virtual Network Gateway 4
The virtual network gateway used determines the actual max linked private clouds. For more information, see About ExpressRoute virtual network gateways
If you exceed this threshold use Azure VMware Solution Interconnect to aggregate private cloud connectivity within the Azure region.
Maximum Azure VMware Solution ExpressRoute port speed 10 Gbps (use Ultra Performance Gateway SKU with FastPath enabled)
The virtual network gateway used determines the actual bandwidth. For more information, see About ExpressRoute virtual network gateways
Maximum number of Azure Public IPv4 addresses assigned to NSX 2,000
Maximum number of Azure VMware Solution Interconnects per private cloud 10
Maximum number of Azure ExpressRoute Global Reach connections per Azure VMware Solution private cloud 8
vSAN capacity limits 75% of total usable (keep 25% available for SLA)
VMware Site Recovery Manager - Maximum number of protected Virtual Machines 3,000
VMware Site Recovery Manager - Maximum number of Virtual Machines per recovery plan 2,000
VMware Site Recovery Manager - Maximum number of protection groups per recovery plan 250
VMware Site Recovery Manager - RPO Values 5 min or higher * (hard-limit)
VMware Site Recovery Manager - Maximum number of virtual machines per protection group 500
VMware Site Recovery Manager - Maximum number of recovery plans 250

* For information about Recovery Point Objective (RPO) lower than 15 minutes, see How the 5 Minute Recovery Point Objective Works in the vSphere Replication Administration guide.

For other VMware-specific limits, use the VMware configuration maximum tool.

In this tutorial, learn how to use the Azure portal to:

  • Add a cluster to an existing private cloud
  • Add hosts to an existing cluster

Prerequisites

You need an existing private cloud to complete this tutorial. If you don't already have a private cloud created, follow the create a private cloud tutorial to create one.

If you are planning on using the AV64 SKU, define a network for the management and control plane. In your Azure VMware Solution private cloud, under Manage, select Clusters > Add a cluster. Then add the Address block for AV64 clusters (one /23 network or three /25 networks) under the Extended address block tab and select Save.

Screenshot showing how to add an AV64 extended address block to an Azure VMware Solution private cloud.

Add a new cluster

  1. In your Azure VMware Solution private cloud, under Manage, select Clusters > Add a cluster. Then select the required SKU from Size of host and specify the Number of hosts for the cluster. Prices listed in image are for illustration only.

    Screenshot showing how to add a cluster to an Azure VMware Solution private cloud.

  2. The deployment of the new cluster will begin.

Scale a cluster

  1. In your Azure VMware Solution private cloud, under Manage, select Clusters.

  2. Select the cluster you want to scale, select More (...), then select Edit.

    Screenshot showing where to edit an existing cluster.

  3. Select Add Host to add a host to the cluster. Repeat that to reach the desired number of hosts, and then select Save.

    Screenshot showing how to add additional hosts to an existing cluster.

    The addition of hosts to the cluster begins.

    Note

    The hosts will be added to the cluster in parallel.

Next steps

If you require another Azure VMware Solution private cloud, create another private cloud following the same networking prerequisites, cluster, and host limits.