A WLD represents a logical boundary of functionality, managed by a single vCenter server instance. Although a WLD usually spans one rack, you can aggregate multiple WLDs in a single rack in smaller setups. In larger configurations, WLDs can span racks.
The following figure shows how one rack can be used to host two different WLDs, the Mgmt WLD and one tenant WLD. A tenant WLD can consist of one or more VxRail clusters, as discussed later in this guide.
A single WLD can stretch across multiple adjacent racks. For example, a tenant WLD that has more VxRail nodes than a single rack can support or that needs redundancy might have to be stretched across multiple adjacent racks, as shown in the following figure:
Depending on the customer workload and application requirements, the correct VxRail hardware platform must be selected. See the VxRail for guidance on sizing for the SDDC components for the different VxRail hardware platforms.