TerraMaster
U4-423 (4Bays)

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U4-423 (4Bays)
U4-423

TerraMaster
U4-423 (4Bays)

Miniaturized Rack-mounted Server
The U4-423 features a compact 1U Rackmount case with a depth of only 360mm (14.17 inches) and weighs just 3.2kg, saving significant space. It offers easy installation without rails and fits most 2-column and wall-mounted small cabinets, making it versatile for various locations like machine rooms, storage rooms, staircases, and offices. Ideal for small office users, the U4-423 operates quietly even under full load, thanks to its high-quality silent fan and optimized internal structure

  • CPU: Intel Quad-Core 2.0 GHz CPU
  • Built-in: 4 GB RAM, 2 Gigabit Ethernet Port
  • Bays: 4-Bay High Performance NAS
SKU: U4-423 Categories: ,

Product Description

Processor
Processor Model Intel® Celeron® N5095
Processor Architecture X.86 64-bit
Processor Frequency Quad Core 2.0 GHz (Max burst up to 2.9 GHz)
CPU Single-Core Score /
Hardware Encryption Engine √
Hardware Transcoding Engine H.264, H.265, MPEG-4, VC-1;maximum resolution: 4K (4096 x 2160); maximum frame rate per second (FPS): 60
Memory
System Memory 4 GB DDR4 non-ECC SODIMM
Pre-installed Memory module 4 GB DDR4 non-ECC SODIMM (1x 4GB)
Total Memory Slot Number 2 (DDR4 SODIMM)
Maximum Supported Memory 32 GB (16 GB+16 GB) DDR4 non-ECC SODIMM
Note TerraMaster reserves the right to replace memory modules with the same or higher frequency based on supplier’s product life cycle status. Rest assured that the compatibility and stability have been strictly verified with the same benchmark to ensure identical performance.
Storage
Disk Slot Number 4
Compatible Drive types 3.5″ SATA HDD
2.5″ SATA HDD
2.5″ SATA SSD
Maximum Internal Raw Storage Capacity 80TB (20TB x4) (Capacity may vary by RAID types)
Drive Hot Swap √
Note  . Hard drive vendors will release their latest models of hard drives, and Maximum internal raw storage capacity may be adjusted accordingly.
. The maximum single volume size is not directly related to the maximum raw capacity.
File System
Internal Drive Btrfs, EXT4
External Drive EXT3, EXT4, NTFS, FAT32, HFS+
External Ports
RJ-45 1GbE Network Jack /
RJ-45 2.5GbE Network Jack 2
RJ-45 10GbE Network Jack /
 SFP+ 10GbE Network Jack /
USB3.1 Host Port 2(10Gbps)
USB2.0 Host Port /
COM /
HDMI 1
VGA /
PCIe Slots /
M.2 2280 NVMe Slot 1
Appearance
Size (H*W*D) 45*440 *360  mm
Packaging Size (H*W*D) 95*545 *453  mm
Weight 6.8 kg
Others
System Fan 40 x 40 x 28mm  3PCS
Fan Mode Smart, High speed, Middle speed, Low speed
Noise Level 34.5 dB(A)
Power Supply 90W
Redundancy Power Supply /
AC Input Voltage 100V – 240V AC
Current Frequency 50/60 Hz, Single frequency
Power Consumption 35.2W(Fully loaded Seagate 4TB ST4000VN008 hard drive(s) in read/write state)
13.9 W (Fully loaded Seagate 4TB ST4000VN008 hard drive(s) in hibernation)
Limited warranty 2 years
Certificate FCC, CE, CCC, KC
Environment RoHS, WEEE
Temperature
Working Temperature 0°C  ~ 40°C (32°F ~ 104°F)
Storage Temperature -20°C ~ 60°C (-5°F ~ 140°F)
Relative Humidity 5% ~ 95% RH
Package Contents
Host (x1)
Power cord (x1)
RJ-45 network cable (x1)
Quick Installation Guide (x1)
 Limited Warranty Note(x1)
Screws(a few)
TOS Features
OS Supported
Supported Client OS Windows OS, Mac OS, Linux OS
Supported Web Browsers Google Chrome 97.0.xxxx, Mozilla Firefox 9.3,Apple Safari 12.1 ; Microsoft Edge 99.0.xx or later version.
Supported mobile OS iOS14.0, Android 10.0 or later version
Storage Management
Supported RAID Types TRAID, Single, JBOD, RAID 0, RAID 1, RAID5, RAID 6, RAID 10
Maximum Internal Volume Number 256
Maximum iSCSI Target 128
Maximum iSCSI LUN 256
Volume Expansion with Larger HDDs TRAID, RAID 1,RAID5,RAID 6,RAID10
Volume Expansion by Adding a HDD TRAID, RAID5,RAID6
RAID Migration √
SSD Cache √
Hot Spare √
SSD TRIM √
Hard Drive S.M.A.R.T. √
Seagate IHM √
NVRAM write cache(BBU-protected) /
Shared Folder Snapshot √
LUN Snapshot /
File Services
File Protocol SMB/AFP/NFS/FTP/SFTP/WebDAV
Maximum Concurrent SMB/AFP/FTP/SFTP Connections 500
Windows Access Control List (ACL) Integration √
NFS Kerberos Authentication √
Account & Shared Folder
Maximum local user’s account number 2048
Maximum local group number 512
Maximum shared folders number 512
Maximum shared folders syncing tasks 8
Backup
Rsync Backup √
Duple Backup √
Centralized Backup √
Snapshot √
USB  Backup √
Cloud Sync √
Time Machine Backup √
File System Snapshot √
TFM Backup √
Networking
TCP/IP IPv4/IPv6
Protocols CIFS/SMB, NFS, FTP, SFTP, HTTPS, SSH, iSCSI, SNMP
Link Aggregation √
DLNA Compliance √
VPN Client √
VPN Server √
Proxy Client √
Proxy Server /
UPnP/Bonjour Discovery √
TNAS.online Remote Access √
DDNS √
Access Right Management
Batch users creation /
Import/Export users √
User Quota Managerment √
Local user access control for CIFS/SAMBA and FTP √
Domain Authentication
AD Domain √
LDAP Client √
LDAP Server /
Security
Firewall Protection √
Account Auto-block Protection √
AES Volume and Shared Folder Encryption √
Importable SSL certificate √
Instant Alert via email, Desktop Notification, Beep √
RSA 2048 Encryption（TOS 5.0） √
PAM (Pluggable Authentication Modules) √
OTP Authentication（TOS 5.0） √
HyperLock File System（TOS 5.0） √
Power Managerment
Power Resume √
Scheduled Power On/Off √
Wake up On LAN（WOL） √
UPS Supported √
Administration
Multi-window, Multi-task System Management √
Custom Desktop √
Control Panel √
Resource Monitor √
Syslog √
OS UI Language English,German, French, Spanish, Italian, Magyar, Chinese,Japanese,Korean，Turkish, Portuguese, Russian
Applications
Application Center √
iSCSI Target √
Terra Photos √
TerraSync √
Duple Backup √
CloudSync √
Centralized Backup √
USB Backup √
VPN Server √
Transmission √
qBittorent √
Aria 2 √
Terra Search √
Deduplication √
Web Server √
Clam Antivirus √
EMBY √
Multi Media Server √
Plex Media Server √
Docker Manager √
Snapshot √

Additional information

U4-423

TerraMaster U4-423
4-Bay High Performance NAS

Miniaturized Rack-mounted Server

The U4-423 adopts 1U Rackmount case with a depth of only 360mm (14.17 inches) weighs merely 3.2kgs, which saves a lot of space. It features simple installation without any rail, it is applicable to most 2-column cabinets and wall-mounted small cabinets, and can be used in a machine room, storage room, staircase, office along with a plethora of other places. suitable for small office users. With a high-quality silent fan and specially optimized internal structure, the U4-423 maintains relatively low noise level when working conditions at full load.

Designed for High Performance Requirements

The 4-Bay U4-423 is suitable for SMB users who need high-performance storage solutions. High performance means that users can easily handle high-load assignments, while multiple business-level backup solutions guarantee user’ data safety and prevent the potential risk of data loss.

Excellent Performance

This is a high-performance storage solution for iSCSI virtual storage and database service for SMB users. It uses an Intel Celeron N5095 quad-core processor with 2.0 GHz and maximum turbo to 2.9 GHz. It is integrated with a GPU graphics card, AES NI hardware encryption, and equipped with two 2.5 GbE interfaces and 4 GB DDR4 dual-channel memory (expandable up to 32 GB).

The Ideal Choice for SMB’ Data Management

The U4-423 can deal with high-load workflow and a high level of concurrent user access. Rapid document storage and management are facilitated by high-speed document retrieval, efficient transmission performance, and rich TerraMaster disaster backup and recovery solutions.

Higher Transmission Speed

The U4-423 is configured with two 2.5 GbE interfaces, supporting 2.5 GbE high-speed network bandwidth. The transmission speed can reach 283 MB/s (Seagate IronWolf 18TB x 4, RAID 0) . Link Aggregation provides a network bandwidth up to 5 Gb, thus providing a cost-effective solution for multi-user and high-concurrent file access.

High Speed Network and Flexible Extension

The U4-423 is configured with two 2.5 Gb interfaces. Link Aggregation provides a network bandwidth up to 5 Gb. The built-in M.2 NVMe slot realizes SSD cache acceleration and significantly increases the storage efficiency of the disk array. To meet performance enhancement expansion requirements, the memory can be extended to as large as 32 GB.

SSD Cache

Flexible Configuration and Management of Disk Arrays

The U4-423 supports rich RAID types, which can be selected based on your data access and data protection level requirements. Hot Spare can be configured for the disk array and any of the following array types can be chosen according to the number of hard disks: Single, RAID 0, 1, 5, 6, 10. To reduce the risk of material loss and ensure important materials are kept, the U4-423 supports online capacity expansion and online migration of RAID array.

TRAID

Across-Platform File Management and Sharing

Supporting most of file services (SMB, AFP, SFTP/FTP, iSCSI, NFS, and WebDAV), the U4-423 can fully satisfy file management requirements in different network environments. TerraMaster’s web file management tool, File Manager, is easily operated with visualized interfaces, while its classification and search functions can make it simple to organize and share data.

Enhance the Safety of your Data with a Superior File System

Superior storage technology and optimized snapshot technology are the cornerstones of the Btrfs file system, which is what TerraMaster’s U4-423 relies on for advanced data protection, the prevention of data corruption, and minimal maintenance expenses. This file system promotes high data integrity while promoting flexibility and efficiency in the areas of data protection and recovery. The btrfs file system features data recovery capabilities at the file or folder level for faster data recovery and greater flexibility for businesses.

Security Isolation Mode
HyperLock-WORM File System
OTP Authorization
Snapshot
Offline Backup

Virtualization Storage Solutions

TerraMaster iSCSI supports VMware vSphere and Windows Hyper-V virtualization storage solutions. The simple management interface enhances working efficiency and optimizes calculation efficiency, as well as facilitating the shunt of storage operations.

iSCSI Manager

Multiple Backup Solutions

Integrated with multiple backup applications, the U4-423 uses visual user interfaces and reliable storage technologies to protect your precious data.
Centralized Backup: Backups for virtual machines, employees’ PCs, and file servers are managed centrally, facilitating the rapid restoration of data after an incident.
Duple Backup: To provide several offsite backup versions, Duple Backup offers advanced data protection by backing up files to another remote TNAS, file server, or cloud drive.
Snapshot: Take continuous snapshots of your folders or iSCSI LUNs by enabling snapshot schedule. When a disaster occurs, it can roll back to points-in-time and restore to the last backup, ensuring your data is well protected.
CloudSync: Back up your data to a mainstream cloud drive to provide remote backup versions, making your data more secure.

Centralized Backup TerraSync
Duple Backup CloudSync
TFM Backup TFSS

Striving to Satisfy Small and Medium-sized Businesses

Business users can easily build file storage servers, mail servers, web servers, FTP servers, MySQL databases, CRM systems, Node.js, and Java virtual machines, as well as a host of other commercial applications.

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