Installing the license key does not automatically start caching. You must assign the SSDs to act as cache for a specific logical volume (RAID array).
Once you have purchased a license, you will receive an entitlement certificate that must be redeemed online at the HPE My Software Center to obtain the actual 25-character activation key. Hewlett Packard Enterprise Open HPE SSA : Launch the HPE Smart Storage Administrator (SSA) utility on your server. Select Controller Hpe Smart Cache License Key
for non-repetitive I/O like routine backups or one-time file access, where data isn't "hot" enough to justify being cached. Additionally, most controllers only support one cache array per controller. Hewlett Packard Enterprise Community Licensing & Compatibility Per-Server Licensing : A separate license key is required for every server where the feature is deployed. Hardware Compatibility Gen10 Servers Installing the license key does not automatically start