HPE 725872-B21 ML150 Gen9 4LFF Hot Plug Drive Cage

• Brand: HPE
• Product / Option: ML150 Gen9 4LFF Hot Plug Drive Cage
• Option Part Number: 725872-B21
• Product Type: Server storage / drive cage accessory
• Supported Server: HPE ProLiant ML150 Gen9
• Drive Form Factor: LFF - Large Form Factor
• Added Drive Bays: 4 LFF
• Drive Interface / Backplane: HPE documentation identifies this as a 4LFF hot-plug drive cage; controller/backplane configuration must be validated for the selected storage architecture
• Hot-Plug Support: Yes - hot-plug drive cage
• Maximum LFF Bays After Addition: Up to 8 LFF drive bays in the ML150 Gen9 configuration
• SFF Alternative: 725874-B21 - 8SFF hot-plug drive cage
• LFF Non-Hot-Plug Alternative: 779859-B21 - 4LFF non-hot-plug drive cage
• H240 Cabling: HPE specifies the 784606-B21 Mini SAS H240 Cable Kit when adding the 4LFF hot-plug cage with the H240 controller
• P440/P840 Cabling: HPE specifies the 784608-B21 Mini SAS P440/P840 Cable Kit for P440/P840 controller configurations
• Compatibility - Ultra Short: ML150 Gen9 only; verify controller and cabling
• Installation Planning: HPE recommends using an HPE-approved configurator to validate complete configurations

Why Choose This Product?

• Exact OEM fit: 725872-B21 is an HPE-defined ML150 Gen9 option, simplifying part identification during enterprise procurement.
• Storage capacity expansion: Adds four LFF hot-plug bays and can take the server configuration to up to eight LFF bays. Hot-plug architecture: Provides a service-oriented storage design rather than the non-hot-plug alternative, making it the better choice when drive-service flexibility matters.
• Protects existing infrastructure investment: Enables storage expansion on an existing ML150 Gen9 rather than automatically requiring a complete server replacement.
• Better configuration accuracy: HPE documents associated cable-kit requirements, helping buyers avoid ordering an incompatible storage expansion. 
• Clear alternative selection: Buyers can directly compare the 4LFF hot-plug option with the 4LFF non-hot-plug 779859-B21 and 8SFF hot-plug 725874-B21.
• Procurement-friendly identification: The unique 725872-B21 option number makes RFQs, asset records, replacement orders, and configuration reviews easier.
• Future capacity planning: Provides an HPE-documented path toward a larger internal LFF storage configuration, supporting phased capacity growth.