Battery-backed write cache module HP 128MB (HP 128MB Battery-Backed Write)

HP 128MB Battery-Backed Write is a cache module with integrated battery backup designed to protect cached write data during unexpected power interruptions. With 128 MB of cache capacity, the module supplements compatible HP storage controllers to preserve data that has been acknowledged to the host but not yet written to persistent media. It helps reduce the risk of write corruption and supports sustained write performance in environments where brief power loss or controller resets may occur.

Advantages

The battery-backed cache maintains volatile write data in the controller until power is restored or the data is safely committed to disk, providing short-term protection without relying on external UPS systems for immediate persistence. The 128 MB capacity offers a balance between protecting in-flight writes and minimizing resource overhead on supported HP controllers. Integration with controller firmware enables automatic failover of cached data to non-volatile storage once power returns, reducing the likelihood of data loss and minimizing recovery time after an outage.

Suitable for

• Server environments running transactional databases or virtual machines that require short-term protection of pending writes
• Storage arrays and RAID controllers where preserving write integrity during brief power interruptions is important
• Systems requiring improved write performance under normal workloads while maintaining data integrity safeguards

Key specifications

• Cache capacity: 128 MB of battery-backed DRAM designed for controller write caching
• Function: Protects cached write data during power loss and controller resets
• Compatibility: Designed for integration with compatible HP storage controllers and firmware that support battery-backed write cache
• Purpose: Short-term power protection to preserve in-flight write operations and reduce write corruption risk

How to use

Install the module into the designated slot on a compatible HP storage controller according to the controller manufacturer’s installation instructions and guidelines. After physical installation, verify that the controller firmware recognizes the battery-backed cache and enable the write cache feature in the controller management utility if required. Monitor controller status indicators and management logs to confirm battery health and cache operation. Replace the battery module following the vendor-recommended maintenance schedule or when diagnostics indicate reduced battery capacity.

Usage recommendations

Use the battery-backed write cache as part of a broader data protection strategy that includes regular backups and appropriate uninterruptible power systems. Periodically check firmware updates for the controller to ensure compatibility and optimal operation. When planning maintenance or replacement, follow safe shutdown procedures and consult HP documentation to avoid data loss during module handling.