The 21H8979 IBM ServeRAID 3H 32MB Battery Backup Cache is a reliable, high‑performance add‑on that safeguards your critical data during unexpected power interruptions. Designed to seamlessly integrate with the ServeRAID 3H controller, it extends cache capacity, ensuring continued read/write operations and preserving transaction integrity. Its robust battery system delivers a safe, graceful shutdown, preventing data loss and minimizing downtime. Ideal for small to medium‑sized businesses that demand uninterrupted storage performance and peace of mind, this component enhances overall system resilience and protects valuable information while maintaining optimal throughput.