HPE Smart Array SR SmartCache is a controller-based caching solution that significantly improves storage performance by caching frequently accessed "hot" data from HDDs onto high-speed SSDs. To activate this feature on many HPE ProLiant servers, a HPE Smart Cache License Key is required. Key Benefits and Features
Workload Acceleration: Accelerates application performance by up to four times by utilizing low-latency SSDs for caching.
Cost Efficiency: Provides SSD-like performance for large datasets without the high cost of an all-flash array.
Write Policies: Supports both Write-Through (caching reads) and Write-Back (caching both reads and writes) for enhanced flexibility.
Data Protection: Supports RAID levels including 0, 1, 10, and 5 for the cache volume to ensure reliability. License Types and Part Numbers
HPE offers several licensing options depending on deployment needs: Hpe Smart Cache License Key
Single-Server License (LTU): A physical entitlement for one server (Part No: D7S26A).
Flexible-Quantity License (LTU): Physical delivery of one key for multiple servers (Part No: D7S27A).
Flexible-Quantity Electronic License (E-LTU): Digital delivery of one key for multiple servers (Part No: D7S27AAE). Hardware Requirements
To use a SmartCache license, your system must typically include: Features and benefits of HPE SR SmartCache
It sounds like you're looking for the correct placement or usage procedure for an HPE Smart Cache license key (likely for HPE storage arrays like Nimble, 3PAR, or MSA). HPE Smart Array SR SmartCache is a controller-based
Here is the proper post-installation / deployment process for applying that license key.
After reboot, the controller begins "warming" the cache. Over hours of normal operation, the most frequently accessed blocks will migrate to the SSDs.
For latency-sensitive applications (like SQL Server or Oracle), Smart Cache can cut read latency from 6–10 milliseconds (HDD) down to <1 millisecond (SSD).
The HPE Smart Array controller (e.g., P408i-a, P816i-a) is physically capable of performing SSD caching. However, HPE divides its feature set via licensing to deliver different tiers of value. Without the license key, the controller’s SSD caching feature remains dormant. The hardware is present; the firmware simply will not activate the functionality.
You might own a powerful Gen10 or Gen11 server, have an unused NVMe or SATA SSD installed, and see no option to assign it as a cache device. This is the "feature not enabled" wall—and the Smart Cache License is the only way to break through it. Prepare the SSDs: You need at least one SSD
The procedure differs slightly depending on the system:
The license is typically sold as a Flexible License (FL) or a Base License. It is often tied to the specific Smart Array Controller's serial number or the server's hardware.
Tip: Ensure you purchase the correct license tier. Some licenses are sold based on the controller model (e.g., licensing for the P-Series controllers).
addlicense -key <your_license_key>
showlicense
setvvcache -on <volume_name>
HPE Smart Cache is a controller-based caching software feature available on HPE ProLiant servers using specific HPE Smart Array Controllers (such as the P408i-a and above).
In simple terms, it allows the controller to use a fast SSD (or a portion of an SSD) as a cache for a larger, slower array of hard drives (HDDs) or lower-tier SSDs.
Without Smart Cache: Your server reads data directly from the spinning drives, resulting in high latency and slower application response times. With Smart Cache: Frequently accessed ("hot") data is copied to the fast SSD. The system reads from the SSD, drastically reducing latency and increasing IOPS (Input/Output Operations Per Second).