| Capability | Description | |------------|-------------| | | Frequently accessed data is promoted to SSD for low-latency reads. | | Write Caching | Incoming writes go first to SSD (fast acknowledgment), later destaged to HDDs. | | Transparent operation | OS and applications see a single logical volume; no driver or app changes required. | | Cache persistence | Cache content survives reboot (if using HPE-supported hardware & non-volatile cache). | | Automatic promotion/demotion | Intelligent algorithms decide which data blocks stay in cache. |
| Legacy Product | Current Replacement | |----------------|----------------------| | HPE SmartCache for Gen8/Gen9 | Gen10+ SmartCache license (R0G53A) | | Cache license tied to server S/N | Now tied to controller S/N (more flexible) | hpe smartcache license key
ssacli ctrl slot=0 show license
| Symptom | Likely Cause | Fix | |---------|--------------|-----| | License invalid error | Wrong controller S/N | Get correct S/N from ssacli ctrl all show detail | | Key not accepted | Entitlement used on another controller | Contact HPE support for license reset | | No performance improvement | Cache device too small / workload not cache‑friendly | Increase cache size or analyze block access pattern | | Cache inactive after reboot | Unsupported cache drive firmware | Update SSD/NVMe firmware to HPE‑approved version | | | Cache persistence | Cache content survives