Dell EMC PowerVault MD 34XX/38XX Series Storage Arrays Administrator's Guide

Benefits of using the SSD cache feature varies depending on your system configuration and network environment. However, workloads that typically benefit the most from using high-performance SSD cache include:

• Workloads where performance is limited by physical disk input/output processes (IOPs).
• Applications that generate a much higher percentage of physical disk reads versus physical disk writes.
• Repeated reads to the same and/or adjacent areas of the physical disk.
• Overall data accessed by an application is routinely less than potential SSD cache capacity. To determine whether this is the case, reviewing the number of virtual disks and sizes that are cached often yields a reliable estimate. The more virtual disks that are cached, the more likely it is that your application accesses more data capacity than can be configured in SSD cache.