Western Digital this week announced two high-end HGST Ultrastar families of SSDs designed for high-frequency workloads in cloud and hyperscale environments that require instant response time. The new drives will act like application accelerators and will thus offer very high sequential and random performance as well as very low latency.

The manufacturer does not reveal a lot of information about the HGST Ultrastar SN200 family, but we do know that it is based on a proprietary controller that is compliant with the NVMe 1.2 specification, uses PCIe 3.0 interface and supports “advanced ECC” (which is probably a marketing way of saying LDPC). The HGST Ultrastar SN200 family of solid-state accelerators consists of two lineups: the SN260 and the SN200. The Ultrastar SN260 is designed for maximum performance, which is why it uses PCIe 3.0 x8 interface and is set to be available in half-height/half-length add-in card form-factor. By contrast, the Ultrastar SN200 uses a more traditional 2.5”/15 mm form-factor along with dual-port U.2 connector featuring PCIe 3.0 x4 interface (dual-port is needed for high-availability systems).

To appeal to different types of customers and workloads, the SN200 and the SN260 SSDs will come in endurance-optimized and capacity-optimized models with the former offering up to three drive writes per day (DWPD) for five years and the latter offering up to 7.68 TB capacity (see the table for details) as well 1 DWPD for five years. Power consumption and other features of different types of drives are similar: they do not consume more than 25 W under load and they support end-to-end data path protection, secure erase, power-loss protection and so on.

When it comes to performance, the HGST Ultrastar SN260 with 800 GB – 7.68 TB capacity is the absolute champion in Western Digital’s product stack and is also among the fastest high-capacity NVMe PCIe SSDs today (it only pales in comparison with Seagate’s Nytro XP7200, which is a PCIe 3.0 x16 SSD with read speeds speced at 10 GB/s). The SN260 is rated at up to 6.4 GB/s for sequential reads and up to 2.2 GB/s for sequential writes (both capacity and endurance models). The new SSDs can perform up to 1.2 million random read IOPS as well as up to 200K/75K random write IOPS (endurance/capacity models).

The HGST Ultrastar SN200 is considerably slower than the SN260 (as expected) with sequential and random reads, but write performance of the two drive families is similar. The SN200 SSD supports sequential read speeds of up to 3300 MB/s as well as sequential write speeds of up to 2100 MB/s.

HGST Ultrastar SN200 Series Specifications
  SN260 SN200
Capacities 800 GB
1,600 GB
3,200 GB
6,400 GB
960 GB
1,920 GB
3,840 GB
7,680 GB
800 GB
1,600 GB
3,200 GB
6,400 GB
960 GB
1,920 GB
3,840 GB
7,680 GB
Form Factors HHHL add-in card 2.5"/15mm U.2
Interface PCIe 3.0 x8 (NVMe 1.2) PCIe 3.0 x4 (NVMe 1.2)
or 2x2 U.2
Controller Proprietary
NAND 128 Gb MLC made using 15 nm process technology (?)
Sequential Read 6100 MB/s 3300 MB/s
Sequential Write 2200 MB/s 2100 MB/s
Random Read (4 KB) IOPS 1,200,000 830,000
Random Write (4 KB) IOPS 200,000 75,000 200,000 75,000
Mixed Random Read/Write
(max IOPS 70%R/30%W, 4KB)
560,000 270,000 500,000 240,000
Write Latency 512 B 20 ms
Power Idle 9 W
Operating 25 W
Endurance 3 DWPD 1 DWPD 3 DWPD 1 DWPD
Encryption AES-256
Power Loss Protection Yes
MTBF 2 million hours
Warranty Five years

Western Digital is sampling its HGST Ultrastar SN200 NVMe family of SSDs to select customers and plans to start their commercial shipments in the first quarter of 2017. The drives will be covered with a five-year warranty and will come with two million-hour MTBF rating.

Related Reading:

Source: Western Digital

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  • vFunct - Wednesday, December 7, 2016 - link

    Is that 20 millisecond write latency correct? Shouldn't it be around 20 microseconds?
  • MrCommunistGen - Wednesday, December 7, 2016 - link

    I'd assume so based on the IOPS (admittedly at 4K) as well as the fact that 20ms is slow for any SSD, let alone one that supposedly offers cutting edge performance.

    I checked the source article and it really doesn't list any of the specs in the table so there must have been additional press info sent out. It lists no latency figures and 512 (bytes or otherwise) appears nowhere in the linked document.
  • ddriver - Wednesday, December 7, 2016 - link

    Looks like someone believes that ms stands for millisecond...
  • shyam334 - Wednesday, December 7, 2016 - link

    missing something?
  • close - Thursday, December 8, 2016 - link

    @shyam334, yeah, he's missing a lot. You don't know the half of it.

    The official spec sheet says "Write Latency 512B (μs)" so it's a typo in AnadTech's table. http://www.hgst.com/sites/default/files/resources/...
    Also Hitachi doesn't refer to it as an "accelerator" anywhere as far as I can tell, just as PCIe SSD.

    @ddriver do I still have to say it =))? That "engineering" school you went to (visit) probably told you it stands for "Microsofts".
  • leexgx - Monday, January 23, 2017 - link

    its 0.020 ms > millisecond ( its 20 µs > 20 microsecond)

  • nagi603 - Wednesday, December 7, 2016 - link

    It's insane that my ramdrive (AMD ramdisk, ddr3) produces speeds that are in the same ballpark (7/9.5GB/s sequential), but has a ~200k IOPS limit.
  • Jhlot - Wednesday, December 7, 2016 - link

    Your ramdrive isn't 800GB let alone 7TB
  • euler007 - Thursday, December 8, 2016 - link

    He found a link to download a lot of ram.
  • TheinsanegamerN - Thursday, December 8, 2016 - link


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