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Most VMware best practices apply to VDI environments, but there are a few changes required due to the nature of high-density VM configurations. For VMware best practices, see the document Dell PowerVault: VMware vSphere Best Practices on the Dell Technologies Storage Info Hub.
There are several factors that determine the optimal volume count with Horizon on PowerVault ME5. There is not a single volume count that fits all scenarios. Performance and management overhead are typically the two most important factors.
For performance reasons, a minimum of 16 volumes is recommended for a VDI workload. This configuration ensures good queue balancing and reduces I/O bottlenecks.
Balance this volume recommendation with the goal of keeping the volume count low for minimized management. The VMware guidance for volume count should also be considered. Using array-based snapshots reduces recovery time and minimizes the impact of higher user-per-volume counts.