The TS-855eU-RP is a 2U rackmount NAS with a short depth and an 8-core processor for optimized virtualization.

Designed for flexible IT deployment and comprehensive virtualization applications, the 2.5GbE NAS TS-855eU-RP
with a short depth can easily fit into a compact cabinet in offices or audio-visual rooms.
Powered by an Intel® 8-core processor, it delivers excellent performance and computing power for fast data access,
backup/restore, file server, and virtualization applications, while also featuring dual power supplies
to ensure maximum system availability. It runs on the QTS operating system by default,
but the TS-855eU-RP can be switched to the ZFS-based QuTS hero operating system if needed.
The TS-855eU-RP will be available and supported by QNAP for a long time (until 2027), which is ideal for businesses
that need matching NAS models for long-term projects.

Compact and space-saving
The TS-855eU-RP is only 11.7 inches (297.4 mm) deep and is perfectly suited for installation in a compact cabinet or in locations with a lot of cables.

Flexible storage expansion
Connect TL-R1620Sep-RP / TL-R1220Sep-RP JBOD units to the TS-855eU-RP to add up to 48 additional drive capacities to match your business growth.

Dual 2.5GbE connectivity
Offers two 2.5GbE ports (compatible with 1G/100M). Supports port aggregation for improved performance and fault tolerance.

Expandability via PCIe
Offers two PCIe Gen 3 slots for installing 5/10/25GbE network cards, QM2 cards, or Fibre Channel cards.

Optimized SSD performance
Dual M.2 PCIe NVMe slots enable SSD caching, SSD storage pools, or Qtier™ auto-tiered storage.

Virtual Machines and Containers
Centralize your virtualization storage and host multiple virtual machines and containerized applications.

Operating system: QuTS hero h5.1.0/QTS 5.1.0
Processor: Intel® Atom® C5125 8-core processor with 2.8 GHz frequency, 64-bit x86.
Floating Point Unit: Yes
Encryption engine: Yes (AES-NI).
System memory: 8 GB non-ECC SODIMM DDR4 (1 x 8 GB).
Maximum memory: 64 GB (2 x 32 GB) – optional. ECC memory support. For dual DIMM configuration, you must use a pair of identical DDR4 modules.
Memory slots: 2 x SODIMM DDR4.
Flash memory: 5 GB (dual OS boot protection).
Hard drive bays: 8 x 3.5-inch SATA 6Gb/s, 3Gb/s.
The system ships without hard drives. For a list of compatible hard drives, visit https://www.qnap.com/compatibility/.
Hard drive compatibility: Supports 3.5-inch SATA hard drives, 2.5-inch SATA hard drives, and 2.5-inch SATA SSD hard drives.

M.2 slot: 2 x M.2 2280 (PCIe Gen 3 x 4). Compatible with NVMe SSD PCIe Gen 3 and later.
For compatibility information, visit https://www.qnap.com/compatibility/.

SSD cache acceleration support: Supported.
SR-IOV: Yes
2.5 Gigabit Ethernet ports: 2x (2.5G/1G/100M/10M).
5 Gigabit Ethernet ports: Optional via network adapter.
10 Gigabit Ethernet ports: Optional via network adapter.
25 Gigabit Ethernet ports: Optional via network adapter.

Wake-on-LAN (WOL): Supported only on 2.5GbE network.
Jumbo Frame size: Supported.
PCIe slots: 2 x PCIe Gen3 (x4) (Slot 1: PCIe Gen 3 (x4), Slot 2: PCIe Gen 3 (x4)).
USB 3.2 Gen 1 ports: 4x
HDMI output: Optional via PCIe graphics card.
Form factor: 2U rack mount with short depth.
LED indicators: HDD 1-8, Status, LAN, USB, Power.
Buttons: Power, Reset.
Dimensions (HxWxD): 88.6 × 432 × 297.4 mm.
Weight (Net): 8.15 kg.
Operating temperature: 0 – 40°C (32°F – 104°F).
Storage temperature: -20 – 70°C (-4°F – 158°F).
Relative humidity: 5-95% relative humidity, non-condensing, wet bulb: 27˚C (80.6˚F).
Power supply: 2 x 300W power supplies, 100 – 240V.
Power consumption (HDD idle mode): 54.331 W.
Power consumption (Operating mode, Typical): 78.73 W (Tested with all WD10EFRX drives).
Fan: 3 x 60mm, 12VDC.
System alert: Buzzer.
Maximum number of simultaneous connections (CIFS): 2500 (with maximum memory).
Warranty: 3 years
5-year warranty extension: LIC-NAS-EXTW-BROWN-2Y-EI