On many HPE Smart Array controllers, this powerful feature is disabled by default . It requires a software entitlement—the HPE Smart Cache License Key —to unlock.
The feature uses (ARC) plus write journaling . In case of power loss, a backup unit (FBWC) preserves cache contents. Hpe Smart Cache License Key
Before discussing the license, we must understand the technology. HPE Smart Cache is a feature of HPE Smart Array Gen10 and Gen10 Plus controllers (and select later models). Historically, RAID controllers used onboard DRAM (Dynamic Random-Access Memory) for cache. This DRAM is fast, but volatile. If a power failure occurred, unwritten data was lost unless you had a battery-backed write cache (BBWC) or a capacitor-based flash-backed write cache (FBWC). On many HPE Smart Array controllers, this powerful