Requires a minimum of 1 GB Flash-Backed Write Cache (FBWC) to enable SmartCache.
Before diving into the license key specifics, let us clarify the technology. HP SmartCache (now under the HPE umbrella) is a feature available on HPE Smart Array Controllers (e.g., P420, P440, P840, and newer Gen10 controllers). It allows a server to use a small, fast SSD (or a set of SSDs in RAID) as a permanent read/write cache for a larger, slower spindle disk array. hp smartcache license key top
HPE offers several licensing models depending on your deployment scale: License Type Description Option Part Number Single-Server (LTU) Requires a minimum of 1 GB Flash-Backed Write