Synology SA3400D Dual SAS Controller 12-Bay ( RAIL KIT optional ) with Redundant Power. PLS CHECK HDD COMPATIBILITY.

Active-passive dual controller design in a single chassis, maximizing service availability with minute-level failover time High Service Availability. Two controller nodes in an active-passive configuration support minute-level failover, minimizing downtime Triple total storage capacity by adding up to two Synology RXD1219sas Expansion Units for 36 total drive bays. Automatic failover mechanism, protecting services in real-time and prevent a single point of failure Easy to deploy and manage data services intuitively with DiskStation Manager (DSM), providing a unified experience across Synology platforms and support comprehensive software applications Certified virtualization solution with license-free workload protection Maximum IP camera: 100 (total of 3,000 FPS at 720p, H.264) (Including two free camera licenses. Additional cameras require the purchasing of additional licenses) Model requires the additional purchase of a Rail Kit for installation in a Server Rack HardDrives and Peripherals- only those listed on the Compatibility List are permitted.