2U short-depth rackmount NAS
2x 2.5GbE, 2x PCIe slots, 2x M.2 NVMe slots
Long-term availability (Up to year 2030)
Designed for flexible IT deployment and comprehensive virtualization applications, the short-depth TS-855eU 2.5GbE NAS can easily fit in a compact rack in offices or audiovisual rooms. Powered by an Intel® 8-core processor, the TS-855eU packs excellent performance and computing benefits to empower fast data access, backup/restoration, file server, and virtualization applications. Running the QTS operating system as standard, the TS-855eU can be switched to use the ZFS-based QuTS hero operating system based on your requirements. The TS-855eU will be available and supported by QNAP for an extended period (up to 2030) , ideal for businesses requiring matching NAS models deployed for long-term projects.
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Compact, space saving
The TS-855eU has a depth of only 11.7 inches (297.4 mm) and is perfectly suited for installation in a compact rack, or places with a lot of cabling.
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Flexible storage expansion
Connect JBOD units to the TS-855eU for adding up to 48 additional drive capacity to match your business growth.
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Dual 2.5GbE connectivity
Features two 2.5GbE ports (backwards compatible with 1G/100M). Supports port trunking for enhanced performance and fault tolerance.
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PCIe expandability
Features two PCIe Gen 3 slots for installing 5/10/25GbE network cards, QM2 cards or Fibre Channel cards.
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Optimized SSD performance
Dual M.2 PCIe NVMe slots enable SSD caching or SSD storage pool for the system drive of QuTS hero.
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Virtual machines and containers
Centralize your virtualization storage, and host multiple virtual machines and containerized apps.
Specification
| CPU | Intel ® Atom® C5125 8-core processor, 2.8GHz |
| CPU Architecture | 64-bit x86 |
| Floating Point Unit |  |
| Encryption Engine | (AES-NI) |
| System Memory | 8 GB non-ECC SODIMM DDR4 (1 x 8 GB) |
| Maximum Memory | 64 GB ( 2 x 32 GB) |
| Memory Slot | 2 x SODIMM DDR4 Support ECC memory For dual-DIMM configuration, you must use a pair of identical DDR4 modules.
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| Flash Memory | 5GB (Dual boot OS protection) |
| Drive Bay | 8 x 3.5-inch SATA 6Gb/s, 3Gb/s
The system is shipped without HDD.
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| Drive Compatibility | 3.5-inch SATA hard disk drives 2.5-inch SATA hard disk drives 2.5-inch SATA solid state drives |
| Hot-swappable | |
| M.2 Slot | 2 x M.2 2280 (PCIe Gen 3 x 4)
Compatible with NVMe SSD PCIe Gen 3 and above.
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| SSD Cache Acceleration Support | |
| SR-IOV | |
| 2.5 Gigabit Ethernet Port (2.5G/1G/100M) | 2 (2.5G/1G/100M/10M) |
| 5 Gigabit Ethernet Port (5G/2.5G/1G/100M) | Optional via a network adapter |
| 10 Gigabit Ethernet Port | Optional via a network adapter |
| 25 Gigabit Ethernet Port | Optional via a network adapter |
| Wake on LAN (WOL) |
Only the 2.5GbE port
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| Jumbo Frame | |
| PCIe Slot | 2 x PCIe Gen3 (x4) Slot 1: PCIe Gen 3 (x4) Slot 2: PCIe Gen 3 (x4) Card dimensions for PCIe slot 1：97 x 68.9x 18.76 mm / 3.82 x 2.71 x 0.74 inches.
Card dimensions for PCIe slot 2：210 x 68.9 x 18.76 mm / 8.27 x 2.71 x 0.74 inches. |
| USB 3.2 Gen 1 port | 4 |
| HDMI™ Output | Optional via a PCIe graphics card |
| Form Factor | 2U Short Depth Rackmount |
| LED Indicators | HDD 1-8, Status, LAN, USB, Power |
| Buttons | Power, Reset |
| Dimensions (HxWxD) | 88.6 × 432 × 297.4 mm |
| Weight (Net) | 8.1 kg |
| Weight (Gross) | 9.6 kg |
| Operating Temperature | 0 - 40 °C (32°F - 104°F) |
| Storage Temperature | -20 - 70°C (-4°F - 158°F) |
| Relative Humidity | 5-95% RH non-condensing, wet bulb: 27˚C (80.6˚F) |
| Power Supply Unit | 250W PSU, 100 - 240V |
| Power Consumption: HDD Sleep Mode | 49.799 W |
| Power Consumption: Operating Mode, Typical | 79.113 W
Tested fully populated with WD10EFRX hard drives.
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| Fan | 3 x 60mm, 12VDC |
| System Warning | Buzzer |
| Standard Warranty | 3 |
| Max. Number of Concurrent Connections (CIFS) - with Max. Memory | 2500 |
