SAS controller HP Enterprise P840 4GB 12G 2-Port internal (726897-B21-RFB)

HP Enterprise SAS controller P840 4GB 12G 2-Port internal (726897-B21-RFB) is a hardware RAID controller for servers and storage arrays. It provides two internal SAS ports with a 12G SAS interface and a 4GB cache designed to improve data throughput and reliability. The controller is intended to manage RAID configurations in environments that require predictable I/O performance and redundancy for business applications such as databases and virtualization workloads.

Advantages

The HP Enterprise P840 offers hardware-level RAID management, offloading RAID computations from the host CPU to maintain application performance. With a 4GB cache, the controller helps smooth bursty I/O and reduce latency under mixed workloads. The 12G SAS interface supports high-speed links to compatible drives and storage backplanes, while the two internal ports enable straightforward cabling to internal drive enclosures. The card is supplied under the HP Enterprise brand and uses the referenced manufacturer part number (726897-B21-RFB).

Suitable for

• Database servers requiring consistent high I/O performance
• Virtualization hosts with mixed read/write workloads
• Storage arrays and internal server storage expansion
• Environments where hardware RAID and redundancy are required

Key specifications

• Brand: HP Enterprise
• Model / MPN: 726897-B21-RFB
• Interface: 12G SAS
• Cache: 4GB
• Ports: 2 internal SAS ports
• Form factor: internal RAID controller for servers and storage arrays
• Category: I/O adapters and controllers
• EAN: 5706998232021

How to use

Install the HP Enterprise P840 into a compatible server PCIe slot according to the server vendor instructions and secure internal SAS connections to the drive backplane or drive cage using appropriate cables or connectors. After physical installation, initialize the controller firmware and configure RAID levels using the HP management utilities or supported BIOS/UEFI console. Create arrays and logical volumes, set cache policies and write-back or write-through modes as required for your workload, and verify that the host operating system recognizes the logical drives.

Recommendations

Use current firmware and vendor-recommended drivers for optimal compatibility and stability. Match the controller with drives and backplanes that support 12G SAS to obtain full interface speed. Configure battery or capacitor-backed cache where supported for safe write caching if data integrity under power loss is a concern. Test RAID configurations and monitor performance under expected workloads before deploying into production.