Home Enterprise Western Digital Ultrastar DC SN840 SSD Announced

Western Digital Ultrastar DC SN840 SSD Announced

by Adam Armstrong
Western Digital Ultrastar DC SN840

Today Western Digital announced a new storage platform, the Western Digital OpenFlex Data24. Along with the new platform, they also announced new NVMe Data Center SSDs in the Western Digital Ultrastar DC SN840. While the SN840 drives come with the OpenFlex Data24, and is designed to work well with it, the drive is also ideal primary storage for HPC or storage arrays looking for high performance, though the drives would be a good fit for AI/ML, OLTP, analytics, and virtualization as well.

Today Western Digital announced a new storage platform, the Western Digital OpenFlex Data24. Along with the new platform, they also announced new NVMe Data Center SSDs in the Western Digital Ultrastar DC SN840. While the SN840 drives come with the OpenFlex Data24, and is designed to work well with it, the drive is also ideal primary storage for HPC or storage arrays looking for high performance, though the drives would be a good fit for AI/ML, OLTP, analytics, and virtualization as well.

Western Digital Ultrastar DC SN840

As we stated in our other article, the Western Digital Ultrastar DC SN840 SSDs will come with the company’s in-house NVMe controller and firmware. The SN840 will use WD’s 96-Layer TLC NAND and come in capacities of 1.6TB, 3.2TB, 6.4TB, 1.92TB, 3.84TB, 7.68TB, 15.36TB in a U.2 form factor. The drive is dual ported for higher availability. Western Digital quotes the SN840 performance at 3,311/3,184 MiB/s Sequential Read/Write and up to 503K IOPS mixed random 70/30 read/write. The drive also offers two different endurance classes depending on workloads: 1DWPD for read intensive and 3DWPD for mixed.

Western Digital Ultrastar DC SN840 SSD Specifications

Endurance 1 DW/D 1 DW/D 1 DW/D 1 DW/D 3 DW/D 3 DW/D 3 DW/D
Capacity 1,920GB 3,840GB 7,680GB 15,360GB 1,600GB 3,200GB 6,400GB
Maximum Petabytes Written 3.504 7.008 14.016 28.032 8.76 17.52 35.04
Interface Western Digital NVMe 1.3c Controller, Dual Port PCIe 3.1 1×4 or 2×2
Form Factor U.2 2.5-inch, 15mm
Flash Memory Technology Western Digital 96-Layer 3D TLC NAND
Performance
Read Throughput (max MiB/s, Seq 128KiB) 3311 3311 3311 3311 3311 3311 3311
Write Throughput (max MiB/s, Seq 64KiB) 2181 3100 3057 3046 2198 3184 3059
Read IOPS (max, Rnd 4KiB) 736K 780K 780K 780K 736K 780K 780K
Write IOPS (max, Rnd 4KiB) 108K 159K 160K 149K 224K 257K 253K
Mixed IOPS (max, 70/30 R/W, 4KiB) 231K 389K 373K 401K 341K 503K 472K
Read Latency (μs) 139 141 157 159 139 141 155
Reliability
Uncorrectable Bit Error Rate 1 in 10^17
MTBF (M hours, projected) 2.5M hours
Annualized Failure Rate5 (AFR, projected) 0.35%
Availability 24 hours x 7 days/week
Limited Warranty (years) 5
Data Retention 40C/90-day equivalent
Power
Requirement (DC +/- 5%) 2V +/-15% 3.3V +/- 15%
Operating (W, max average) 18
Idle (W) 6
Physical Size
z-height (mm) 15
Dimensions (w x l, mm) 69.85 x 100.45
Environmental
Operating Temperature 0° to 70°C (Case)
Non-Operating Temperature -40° to 85°C

Western Digital Ultrastar DC SN840 Availability

Ultrastar DC SN840 NVMe SSD is targeted for next month, July 2020

Western Digital Ultrastar NVMe Drives

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