QNAP TS-855eU 8-Bay Short-Depth Rackmount NAS

More Computing Flexibility in a Compact Rack Give business files, backups and applications a storage platform with room to develop. The QNAP TS-855eU pairs an eight-core Intel Atom processor with eight SATA bays, dual 2.5GbE networking and two built-in NVMe slots. Two PCIe expansion slots provide further options for a carefully planned deployment. Its 297.4 mm short-depth chassis fits suitable compact racks, while Single and Redundant factory power configurations let you choose the arrangement that suits the site. Highlights Eight-Core Business Processing Intel Atom C5125 processing supports concurrent storage and supported application tasks. Factory 8GB DDR4 memory can expand to 64GB using compatible modules. Hybrid Storage Choices Eight SATA bays and two M.2 NVMe slots allow separate capacity and SSD roles. Select QTS or plan a ZFS-based QuTS hero deployment around the required applications. Compact Chassis with Expansion Two 2.5GbE ports and two PCIe Gen3 ×4 slots support an adaptable wired-storage design. Choose Single or Redundant power without changing the core processor or drive-bay arrangement. Key Features Fit Business Storage into a Shallower Rack The 2U short-depth enclosure measures 297.4 mm deep and can suit offices, AV cabinets and other installations where rack depth is limited. Plan clearance for connectors, airflow and the selected rail kit as part of the installation. Eight front-access SATA bays keep the capacity platform accessible without requiring a full-depth storage chassis. Run Concurrent Services with Eight-Core Processing The Intel Atom C5125 provides eight cores at 2.8GHz, with AES-NI and Intel QuickAssist Technology support. Factory memory is 8GB non-ECC DDR4 SODIMM and can expand to 64GB with compatible modules. ECC memory is supported when correctly configured. Allocate processing and memory capacity across file services, backup jobs and any virtualisation tasks rather than treating every application independently. Give NVMe Storage Its Own Role Two M.2 2280 PCIe Gen3 ×4 slots support compatible NVMe SSDs for caching or an appropriate storage pool. In a QuTS hero deployment, an SSD RAID system pool can help separate system and application activity from the SATA capacity bays. Choose suitable SSD endurance and cooling, and plan installation before use because the built-in M.2 slots are not hot-swappable. Expand the Interfaces to Suit the Site Dual 2.5GbE ports provide the built-in wired connections. Two PCIe Gen3 ×4 slots can accept supported network, storage or other cards, subject to their different physical card limits. This leaves useful choices for higher-speed networking or compatible storage expansion. Expansion cards, modules and enclosures are separate purchases, and the complete configuration needs compatibility checks. Choose QTS or a Planned ZFS Deployment QTS supports a broad file-sharing and application environment. QuTS hero offers a ZFS-based alternative for deployments focused on data integrity and suitable storage features. The factory 8GB meets the stated QuTS hero minimum, while heavier workloads and deduplication need additional resources. Changing operating systems requires a planned backup and storage reinitialisation. Make Recovery Part of the Storage Design Snapshots, Hybrid Backup Sync and supported synchronisation tools provide different layers of recovery and collaboration. Maintain an independent, current backup and test restoration. A NAS can also support compatible surveillance or application workloads, but their storage, network and licensing requirements need to be sized alongside ordinary business activity. Select the Right Factory Power Arrangement The Single configuration has one 250W supply. The Redundant factory RP configuration has two power supplies, each rated at a minimum of 300W. The choice affects power resilience, weight and measured consumption. It does not change the common eight-core processor or storage interfaces, and the Single chassis is not an upgradeable RP configuration. Summary The TS-855eU combines eight-core computing, hybrid storage choices and dual PCIe expansion in a compact rackmount platform. It is a practical foundation for a planned mix of shared files, backups and supported applications, with the factory power option selected to suit the installation. What changes between Single and Redundant?ExpandCollapse The Single model uses one 250W power supply. The Redundant factory RP model uses two supplies, each rated at a minimum of 300W. Their core processor, factory memory, drive bays and network interfaces match; weight and measured power consumption differ. Single is not upgradeable to RP. Are the drives and rail kit included?ExpandCollapse Drives and the optional rail kit are purchased separately. Select compatible drives for the intended workload and check the rack post spacing, hole type and clearance. The Compatible Accessories section links the exact RAIL-B02 option and a listed Seagate NAS hard-drive model. Can it use both QTS and QuTS hero?ExpandCollapse The model supports either operating system, selected for the deployment. The factory 8GB meets the QuTS hero minimum, while heavier services may need more memory. Switching between the two requires a planned backup, migration and reinitialisation because their file systems differ. Does it have built-in 10GbE or 25GbE?ExpandCollapse No. Its two built-in Ethernet connections are 2.5GbE RJ45. Supported PCIe network cards can add higher-speed connections. Check the exact card, slot dimensions, switch, cabling and workload before ordering an upgrade. Can NVMe SSDs be used without occupying the SATA bays?ExpandCollapse Yes. Two built-in M.2 2280 PCIe Gen3 ×4 slots support compatible NVMe SSDs for supported cache or storage configurations. SSDs are sold separately, and suitable cooling is recommended. These built-in slots are not hot-swappable. How many cameras can it record?ExpandCollapse The workable number depends on the QVR application, installed memory, camera resolution, codec, frame rate and other NAS activity. QVR Pro on QTS includes eight channels. QVR Surveillance starts with two and allows six more through registration. Software ceilings and any calculator estimate are listed separately in Specifications; neither is a guaranteed maximum for every installation. Read more