Product description

Genuine IBM/LSI Super Capacitor Backup Unit (BBU)

Protect your RAID controller's cache from data loss during power interruptions. This is a flash-backed cache protection (FBWC) super capacitor pack designed for select IBM ServeRAID controllers and compatible IBM System x servers — engineered to hold cached write data safely during unexpected power loss.

Key Details

• Part Number: 81Y4579
• FRU Number: 00JY023
• Alternative/Cross Part Numbers: 49571-01, 81Y4577, N28636
• Compatible Controllers: IBM ServeRAID M5100 Series (and related M5xxx family controllers)
• Compatible Servers: IBM System x3650 M4, x3550 M4, and other System x servers using supported ServeRAID cards
• Component Type: Super capacitor flash power / backup battery pack
• Electrical Rating: 13.5V, 6.4F (typical for this capacitor pack — confirm against your specific unit)
• Function: Provides flash-backed write cache (FBWC) power, allowing cached data to be written safely to flash memory during a power failure
• Condition: [specify — New / Pulled / Refurbished, based on your actual stock]

Why This Battery Matters

Unlike traditional battery-backed cache (BBU) modules, this super capacitor pack works with flash-backed write cache technology — it holds enough charge to flush cached data to non-volatile flash memory during a power event, rather than just holding data in volatile cache. This gives longer-lasting protection with less maintenance than older battery-only designs, and is essential for maintaining RAID array performance and data integrity.

Shipping & Handling

• Carefully packed in anti-static packaging with cushioning to prevent damage in transit
• Shipped via standard carrier (UPS/FedEx/DHL) — specify your shipping method here

Compatibility Note

Confirm your ServeRAID controller model and server chassis against the compatible list above before ordering — flash power modules are connector- and controller-specific and are not universally interchangeable across IBM RAID card generations.