Dell DVS Simplified Appliance Tower Reference page 13

Delivery controllers: These servers manage and broker the end-user connections to the
virtual desktops. Typically, a minimum of two delivery controllers/connection brokers is
required for high-availability.
Virtual desktop hosts: These are the servers that run the virtual desktop workload and
the number of these depends on their capacity and the sizing guidelines of the VDI
solution.
Load balancers: A minimum of two load balancers are typically placed in front of the
delivery controllers to evenly distribute the desktop workload.
Shared storage SAN: Shared storage is required to create a centralized storage resource
pool for the running virtual desktops, so that in the event of a server failure, a different VM
host can pick up the desktop state from the SAN and run the desktops.
High-speed interconnects: Typically, for performance reasons, high-speed interconnects
are used among these components.
While this DVS Enterprise VDI architecture is cost-effective for large deployments, it
requires a sizable investment that may not be efficient for smaller deployments. Dell
configures the solution for customers and provides a thoroughly-tested, well-integrated
appliance.
Figure 1: Enterprise VDI
While a DVS Enterprise VDI architecture is cost-effective for large deployments, it requires
a sizable investment that may not be efficient or ideal for smaller deployments. Either way
however, we configure the solution for you and provide a thoroughly-tested, well-
integrated appliance that will fit your needs.
Figure 2 below references a Citrix "VDI-in-a-Box" deployment using a grid architecture
that makes expansion easy and delivers high-availability (HA) without requiring externally
attached shared storage (such as a SAN). This results in a significant cost savings. To
expand a VDI-in-a-Box deployment, simply load the Citrix software on additional Dell
10 Dell DVS Simplified Appliance Reference Architecture