The Consolidated SDDC differentiates between two types of clusters - consolidated cluster and secondary storage.
Figure 1. Clusters in the Consolidated Software-Defined Data Center


A consolidated cluster (4 ESXi hosts) and a secondary storage cluster are in one rack with two ToR switches.

Consolidated Cluster

The consolidated cluster runs the following services:

  • Virtual machines to manage the SDDC such as vCenter Server, NSX Manager, vRealize Automation, vRealize Log Insight, and vRealize Operations Manager.

  • Required NSX services to enable North-South routing between the SDDC and the external network, and East-West routing inside the SDDC.

  • Virtual machines running tenant applications according to certain Service Level Agreements (SLAs).

Secondary Storage

Secondary storage provides additional storage for backup. It can be based on the NFS, iSCSI or Fibre Channel technology. Different types of storage can provide different levels of SLA, ranging from just a bunch of disks (JBODs) with minimal to no redundancy, to fully redundant enterprise-class storage arrays. For bandwidth-intense IP-based storage, the bandwidth of these pods can scale dynamically.

Note:

This design uses VMware vSAN as its primary storage platform. Considering block or file storage technology for primary storage is out of scope of the design. These storage technologies are referenced only for specific use cases such as backups to secondary storage.