Synology SA3400D 12-Bay Active-Passive NAS Enclosure with Dual Controllers
Description
The Synology SA3400D is a high-availability 2U rackmount SAN/NAS solution featuring dual active-passive controllers to minimize downtime. It supports 12 hot-swappable 3.5″/2.5″ SAS drive bays, scales up to 36 bays via two RXD1219sas expansion units, and delivers enterprise-grade performance for both file and block storage workloads.
Hardware Specifications
| Specification | Details |
|---|---|
| Controllers | 2 × Intel® Xeon® D series processors, 8 cores, boost up to 2.7 GHz |
| Drive Bays | 12 × hot-swappable 3.5″/2.5″ SAS HDD/SSD |
| Scalability | Up to 36 drives (576 TB raw) with 2 × RXD1219sas expansion units |
| Memory | 8 GB DDR4 ECC UDIMM per controller, expandable to 64 GB per controller |
| Storage Media | Dedicated SATA DOM module isolates DSM OS from data volumes |
| Controller Interconnect (NTB) | High-speed non-transparent bridge for workload synchronization |
| Network Interfaces | Built-in RJ-45; optional 10 GbE/25 GbE NICs via PCIe slots |
| Expansion Slots | PCIe Gen3 ×8 (per controller) for additional NICs or NVMe cache cards |
| Power Supplies | 2 × 500 W hot-swappable ECC modules |
| Cooling | Dual hot-swappable fans per controller |
| Form Factor | 2U rackmount; 19″ wide |
| Warranty | 5-year limited hardware warranty |
Key Software & Features
- High Availability
Automatic minute-level failover between controllers to keep services online and protect against hardware failures. - Unified SAN/NAS Storage
Serve files over SMB, NFS, and AFP while providing block storage via iSCSI and Fibre Channel. - Btrfs File System
Metadata mirroring, inline compression, checksums, and self-healing to prevent silent data corruption. - Backup & Recovery Suite
Snapshot Replication, Hyper Backup, Active Backup Suite, and Active Backup for Microsoft 365/Google Workspace for multi-destination protection. - Synology Drive & Collaboration
Private-cloud file sharing, version history, and real-time collaboration across desktop and mobile clients. - Centralized Management
Intuitive DSM interface with centralized control of storage pools, snapshots, and monitoring.
Performance & Scalability
- Sequential Throughput
Over 3,500 MB/s read and 2,900 MB/s write for SMB workloads; up to 340,000 IOPS (4 KB random read) and 130,000 IOPS (4 KB random write) with SSDs. - Volume Capacity
Up to 108 TB per volume on default memory (expandable to 200 TB with 32 GB RAM upgrade). - Online Scale-Out
Attach up to two RXD1219sas units without service interruption to grow raw capacity from 12 to 36 drives.
Ideal Use Cases
- Enterprise SAN Storage for virtualization and database applications
- Centralized file server with high-availability SLAs
- Consolidated backup repository for physical, virtual, and cloud workloads
- Hybrid cloud gateway with on-premises acceleration and cloud archival
- Mission-critical application hosting requiring sub-minute failover
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