The Synology UC3400 is an enterprise-grade 12-bay 2U active-active SAN enclosure engineered for mission-critical environments requiring zero downtime and uninterrupted block storage services. Features dual 2.1 GHz Intel Xeon D-1541 8-core processors (one per controller) with 16GB DDR4 ECC RAM (8GB per controller, expandable to 128GB total), working simultaneously in active-active architecture to ensure continuous operation during controller failures. Delivers over 180,000 4K random write IOPS with support for both Fibre Channel (FC) and iSCSI protocols, achieving over 199,000 IOPS via FC and over 189,000 IOPS via iSCSI, with mixed workload performance reaching over 455,000 IOPS via FC. Features dual 10 Gigabit Ethernet and four Gigabit Ethernet ports (one 10GbE and two 1GbE per controller) with link aggregation and failover support. Built with dual redundant 500W power supplies and hot-swappable 60mm fans (two per controller). Supports 3.5" SAS drives and 2.5" SAS SSDs with flexible RAID configurations (0, 1, 5, 6, 10, Basic, F1, JBOD) and AES-NI encryption, plus native self-encrypting drive (SED) support. Non-transparent bridge (NTB) technology ensures maximum protection of in-flight data during inter-domain communication. Expandable to 36 drive bays (576TB raw storage) using two RXD1219sas expansion units, with two PCIe Gen3 x8 slots (one per controller) for 10/25GbE network cards or 16Gb Fiber Channel host bus adapters. Running on DiskStation Manager (DSM) with application-aware Snapshot Replication for instant VM recovery. Fully certified for VMware vSphere, Microsoft Hyper-V, Citrix XenServer, and OpenStack with VAAI, ODX, and ALUA support. Ideal for organizations requiring mission-critical storage systems with maximum service uptime. Backed by a 5-year limited warranty with Synology Replacement Service (SRS) offering next-business-day advance replacement in selected regions.