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Review: Qnap TS-251B

by Parm Mann on 10 January 2019, 14:00

Tags: Qnap

Quick Link: HEXUS.net/qad3af

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Test Methodology

NAS Comparisons

  CPU Memory Disk Drives RAID Mode Firmware Date Reviewed Reviewed Price
Asustor AS6202T 1.6GHz Intel Celeron N3150 (quad-core) 4GB DDR3 2x 4TB WD Red WD40EFRX (optional) RAID 1 2.6.6.RCF2 January 2017 £390
Drobo 5N2 1.6GHz Marvell Armada XP MV78460 (quad-core) 2GB DDR3 5x 4TB WD Red WD40EFRX (optional) Beyond 4.0.2 August 2017 £460
Qnap TS-228A 1.4GHz Realtek RTD1295 (quad-core) 1GB DDR4 2x 4TB WD Red WD40EFRX (optional) RAID 1 May 2018 £150
Qnap TS-231P 1.7GHz Annapurna Labs Alpine AL-212 (dual-core) 1GB DDR3 2x 4TB WD Red WD40EFRX (optional) RAID 1 4.2.3 February 2017 £180
Qnap TS-251A-4G 1.6GHz Intel Celeron N3060 (dual-core) 4GB DDR3 2x 4TB WD Red WD40EFRX (optional) RAID 1 4.2.2 September 2016 £330
Qnap TS-251B-2G 2.0GHz Intel Celeron J3355 (dual-core) 2GB DDR3 2x 8TB Seagate IronWolf ST8000VN0022 (optional) RAID 1 January 2019 £310
Qnap TS-253B-8G 1.5GHz Intel Celeron J3455 (quad-core) 8GB DDR3 2x 4TB WD Red WD40EFRX (optional) RAID 1 4.3.3 August 2017 £600
Qnap TS-453Bmini-4G 1.5GHz Intel Celeron J3455 (quad-core) 4GB DDR3 4x 4TB WD Red WD40EFRX (optional) RAID 10 May 2017 £460
Synology DS216j 1.0GHz Marvell Armada 385 88F6820 (dual-core) 512MB DDR3 2x 4TB WD Red WD40EFRX (optional) RAID 1 5.2-5644 March 2016 £140
Synology DS216play 1.5GHz STM STiH412 (dual-core) 1GB DDR3 2x 4TB WD Red WD40EFRX (optional) RAID 1 6.0.2-8451-1 September 2016 £185
Synology DS918+ 1.5GHz Intel Celeron J3455 (quad-core) 4GB DDR3 4x 8TB Seagate IronWolf ST8000VN0022 (optional) RAID 10 6.2-23739 Update 2 September 2018 £500
WD My Cloud Pro Series PR2100 1.6GHz Intel Pentium N3710 (quad-core) 4GB DDR3 2x 8TB WD Red WD80EFZX (included) RAID 1 2.21.111 August 2016 £860

HEXUS Test Client

Hardware Components Product Page
Processor Intel Core i7-8700K intel.com
CPU Cooler Fractal Design Celsius S24 fractal-design.com
Motherboard Asus ROG Maximus X Hero asus.com
Graphics Card MSI GeForce GTX 1080 Ti Gaming X Trio msi.com
Memory G.Skill Trident Z 32GB (2x16GB) DDR4-3200 gskill.com
Power Supply be quiet! Dark Power Pro 11 1,000W bequiet.com
Primary Storage 256GB WD Black PCIe SSD wdc.com
Secondary Storage 1TB Crucial MX300 SATA SSD crucial.com
Chassis be quiet! Dark Base 700 bequiet.com
Monitor iiyama ProLite X4071UHSU-B1 iiyama.com
Operating system Windows 10 Pro microsoft.com

HEXUS Test Client - Pre-2018

Hardware Components Product Page
Processor Intel Core i7-6700K intel.com
CPU Cooler Noctua NH-D15S noctua.at
Motherboard Asus Z170 Pro asus.com
Memory Crucial Ballistix Sport LT 32GB (2x16GB) DDR4-2400 crucial.com
Power Supply be quiet! Dark Power Pro 11 850W bequiet.com
Primary Storage 256GB Samsung 950 Pro samsung.com
Secondary Storage 512GB SK hynix Canvas SC300 skhynix.com
Chassis Fractal Design Define R5 Windowed fractal-design.com
Monitor Philips Brilliance 4K Ultra HD LED (288P6LJEB/00) philips.co.uk
Operating system Windows 10 microsoft.com

HEXUS NAS Benchmark Suite

Benchmark Test Description
CrystalDiskMark Sequential Read A 1GB sequential read using a 128KB block size.
Sequential Write A 1GB sequential write using a 128KB block size.
4K Read Q32 A random spread of 4KB reads at a queue depth of 32.
4K Write Q32 A random spread of 4KB writes at a queue depth of 32.
Intel NASPT Content Creation 98 files, 39 per cent sequential, 95 per cent writes up to 64KB
Office Productivity 607 files, 81 per cent sequential, 1KB reads and writes.
Directory Copy From NAS 2,833 files, 53 per cent sequential, 64KB reads.
Photo Album 169 files, 80 per cent sequential, 100 per cent reads of various sizes.
Power Consumption Load NAS power draw recorded while running CrystalDiskMark.
Idle NAS power draw recorded when idle.
Standby NAS power draw recorded with drives in standby, if applicable.
Noise A PCE-318 meter is used to record noise output while running CrystalDiskmark.


All comparison servers are tested using a single Gigabit Ethernet link with jumbo frames disabled and are connected to our test client and network via a TP-Link TL-SG1024 switch.

Server and storage benchmarks are fraught with numerous variables, ranging from disks used, file system, network equipment and of course the number of connected clients. All NAS units tested prior to August 2018 were done so using 4TB WD Red hard disks, or in the case of fully-populated units, any drives supplied by the manufacturer. As of September 2018, we have migrated our test methodology to include newer 8TB Seagate IronWolf disks; the Synology DS918+ is the first NAS to be tested with the higher-capacity drives.

To provide a look at potential performance, our first benchmark is the freely available and widely used CrystalDiskMark. Our second benchmark - NAS Performance Toolkit, developed by Intel - is a file-system exerciser designed to provide performance comparisons between network storage devices. Intel's utility focuses on user-level performance using real-world workload traces gathered from common applications. NASPT reproduces the file-system traffic observed in various traces onto a chosen storage device and records performance in MB/s.

Last but not least, we measure NAS power draw during three states; under load, idle and standby mode if applicable, while a noise reading is taken using a PCE-318 meter.