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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 EMC PowerStore: VMware vSphere Best Practices on the PowerStore Info Hub.
With most applications, storage traffic is typically 70% reads. There are applications that generate all reads or all writes, but the average tends to be a 70% read to 30% write ratio.
There are several factors that determine the optimal volume count with Horizon on PowerStore. 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. 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. Internal testing shows that 16 volumes can support 3,000 users from a performance perspective but may have an impact on VM recovery from a backup. Using array-based snapshots reduces recovery time and minimizes the impact of higher user-per-volume counts.