vSAN-based appliances solutions provide flexibility as you scale, reducing the initial and future cost of ownership. Add additional physical and virtual servers to the server pools to scale horizontally. Add virtual resources to the infrastructure to scale vertically.
Each component of the solution architecture scales independently depending on the required number of supported users. You can add appliance nodes at any time to expand the vSAN SDS pool in a modular fashion. The scaling limit for vSAN is restricted by the limits of the hypervisor at 64 nodes per block.
The recommended limit of linked clones per cluster is 4,000.
Each instance of VMware vCenter can service a maximum of 4,000 linked or full clone virtual machines. A Citrix "pod architecture" consists of a virtual desktop "site" and one or more "zones" at each site. The following figure shows a 4,000-user MCS linked clone/vSAN configuration, which equates to a single zone within a site:
The following figure shows a scale-out of 20,000 MCS linked-clone VMs with vSAN. The recommended limit for a zone is 10,000 sessions. In this example, there are two sites with three zones each. The sites are load-balanced and presented to the users as a single entity.
Dell Technologies recommends a validated disk configuration for general-purpose VDI. These configurations leave drive slots available for future vertical expansion and ensure that you protect your investment as new technology transforms your organization.
For more information about Citrix best practices for scaling, see Citrix VDI Handbook and Best Practices.