QNAP TS-253D-4G-US Quad-core 2.5GbE NAS Server for SMB

Specifications

• Mfr Part Number: TS-253D-4G-US
• Hardware:
  • CPU: Intel Celeron J4125 dual-core 2.0 GHz processor (burst up to 2.7 GHz)
  • Encryption Acceleration
  • System Memory: 4 GB SO-DIMM DDR4 (1 x 4 GB)
  • Maximum Memory: 8GB (2x 4GB)
  • Memory Slot: 2 x SO-DIMM DDR4
  • Flash Memory: 4GB (Dual boot OS protection)
  • Drive Bay: 2 x 3.5-inch SATA 6Gb/s, 3Gb/s
  • 2.5 Gigabit Ethernet Port (5G/2.5G/1G/100M): 2
  • 5 Gigabit Ethernet Port (5G/2.5G/1G/100M): Optional via PCIe expansion card
  • 10 Gigabit Ethernet Port: Optional via PCIe expansion card
  • USB Port: 3x USB 2.0 Ports, 2x  USB 3.2 Gen 1 port
  • PCIe Slot: Slot 1: PCIe Gen 2 x4
  • LED Indicator: Status/Power, LAN, USB, HDD 1-2
  • Button: Power, Reset, USB copy
  • System Warning: Buzzer
  • Operating System: QTS 4.4.2 (embedded Linux)
• Network & Virtual Switch:
  • TCP/IP: Dual stack (IPv4 and IPv6)
  • Jumbo frame
  • DHCP server and client
  • RADVD
  • USB Wi-Fi adapter Note: This feature does not support ad hoc networks because of security considerations.
  • Static Route
  • NCSI (Network Connectivity Status Indicator)
  • DDNS settings (Customize & Multiple Service)
  • Port trunking（Link aggregation）
    • failover
    • Load balancing
  • Virtual switch
    • Network Address Translation (NAT)
    • Spanning Tree Protocol (STP)
    • Thunderbolt to Ethernet converter (T2E)
    • Software-Defined Switch mode
• Security:
  • Network access protection with auto-blocking – SSH, Telnet, HTTP(S), FTP, CIFS/SMB, AFP
  • Host access control for shared folders (CIFS/SMB)
  • AES 256-bit folder-based and volume-based encryptions which are validated by FIPS 140-2 CAVP (Cryptographic Algorithm Validation Program)
  • 256-bit external drive encryption
  • Importable SSL certificates
  • Instant alert via E-mail, SMS, beep, and push service
  • 2-step verification
• Storage Management:
  • Supported RAID types: RAID 0, 1, JBOD, Single
  • RAID Hot Spare and Global Hot Spare
  • RAID Rebuild Speed Customization
  • Online RAID capacity expansion
  • Online RAID level migration
  • SSD RAID Over-provisioning Note: RAID 0 and JBOD Data RAID does not support Over-provisioning.
  • SSD RAID Performance evaluation (with SSD Profiling Tool)
  • SSD TRIM for RAID 0,1
  • Bitmap support
  • Disk auto S.M.A.R.T. data migration
  • Disk bad block scan and S.M.A.R.T test.
  • Disk bad block recovery
  • Disk secure data erase
  • Ironwolf Health Management
  • Storage pools
  • Online volume expansion
  • Volume type conversion
  • Volume shrink
  • Storage space utilization
  • Storage expansion using QNAP expansion units 
  • JBOD enclosure roaming
  • SSD read-only and read-write cache
  • SSD write-only cache
  • Qtier Data Tiering Technology
    • Automatic or scheduled data tiering
    • IO-aware auto tiering
    • Shared folder tiering on demand
  • Flexible volumes and LUNs with thin provisioning and space reclaiming
    • If the NAS has less than 4GB RAM, then the maximum volume capacity is 144TB.
    • If the NAS has at least 4GB RAM, then the maximum volume capacity is 250TB.
  • Snapshots
    • Volume and LUN snapshots
    • Snapshot Dashboard
    • Snapshot Manager
    • Snapshot local restore and revert
    • Snapshot Clone Snapshot Replica and Snapshot Vault
    • Snapshot remote restore and revert
    • Unified Snapshot Directory
    • Support for Windows Previous Versions (CIFS/SMB)
• File System:
  • Internal HDD: EXT4
  • External HDD: EXT3, EXT4, NTFS, FAT32, HFS+, exFAT
• Form Factor: Tower
• Security Slot: Kensington security slot
• Fan: 1 x 70mm, 12VDC
• Power Supply Unit: External Power Adapter, 65W, 100-240V
• Dimensions (WxDxH): 4.13 x 8.90 x 6.61 inch
• Weight: 3.26 lbs