VMware supports large Software-Defined Data Center (SDDC) appliances on VMware Cloud on AWS. When deploying SDDC, there is an option to choose the size of the management appliances – Medium (default) or Large.
Large SDDCs are ideal for addressing a larger density of workloads on the SDDC:
A key benefit of deploying a large SDDC is that it supports enhanced network throughput on the NSX Edge appliance.
Large-sized deployments with more than 30 hosts or 3000 VMs, or if the resources (CPU or memory) are oversubscribed in the management cluster.
Large Scale SDDC's can be scaled in two ways:
Runtime - existing SDDC
New SDDC deployment
There should not be any Hybrid Cloud Extension (HCX) or Disaster Recovery (DR) process running while Upscaling the SDDC.
The Upscaling workflow will make sure that there is no EDRS, Upgrade, or remediation running in the SDDC.
There should be enough space in the primary cluster to accommodate large appliances.
Time taken for the Upscaling Workflow is as follows:
a)vCenter ~15 min
b)NSX scaling ~25 min
c)Backup ~30 min depending on the SDDC Size
Deploying a new SDDC of Large Size :
The VMC Sizer tool can be used to plan the deployment with a large SDDC option.
2.Runtime scaling of the SDDC: