back to article Seagate flaunts 4TB-ish enterprise SAS flash that can shift 1.8GB/s

Seagate has announced a not-quite 4TB, dual-port SAS SSD technology, built in an alliance with Micron: the drive giant is touting four 1200.2 products defined by their endurance. Micron is using the same tech in its S600DC SSD products. The 1200.2 is the first SSD, Seagate says, to optimize dual-port SAS capability, resulting …

  1. Nate Amsden Silver badge

    don't forget Sandisk

    I saw the 1 DWPD number and was wondering what Sandisk offers, on the HP 3PAR flagship 3.84TB SSD from Sandisk, the Sandisk specs say 0.5 DWPD under transactional workloads. Though HP backs that with a 5 year unconditional warranty. The previous cMLC 1.92TB SSD under 3PAR HP says you'd have to write 8PB of data to it before it wore out (which is pretty impressive to me compared to the 150TB on my Samsung consumer 850 Pro)

    http://www.sandisk.com/enterprise/sas-ssd/optimus-max-ssd/

    http://www8.hp.com/h20195/v2/GetPDF.aspx/4AA5-9954ENW.pdf

    "Flash SSD endurance is significantly enhanced as a result of HP 3PAR StoreServ Flash Storage distinctive “Adaptive Sparing” that unlocks the hidden capacity present in each flash SSD. Unlocking that hidden capacity permits the HP 3PAR StoreServ Flash Storage to utilize that spare capacity as additional over-provisioned capacity. This is what enables HP to convert a SAS SanDisk 3.84TB read optimized flash (SSD) to being both write and read-optimized and guarantee a 5 year warranty if it ever wears out."

    (Dell recently announced 3.84TB SSDs but I am unsure if they are supported for write optimized workloads or not, since Dell does not have technology similar to Adaptive sparing that I know of)

    So even with 1DWPD, if you have the right kind of storage tech surrounding that SSD you can get quite a bit more out of the drive then you might otherwise expect.

  2. iOS6 user

    "The HGST drives' performance is 130,000 random read IOPS and 1.1GB/sec sequential read bandwidth"

    According to https://en.wikipedia.org/wiki/PCI_Express

    PCI express speed is:

    * v1.x (2.5 GT/s):

    250 MB/s (×1)

    4 GB/s (×16)

    * v2.x (5 GT/s):

    500 MB/s (×1)

    8 GB/s (×16)

    * v3.0 (8 GT/s):

    985 MB/s (×1)

    15.75 GB/s (×16)

    * v4.0 (16 GT/s):

    1969 MB/s (×1)

    31.51 GB/s (×16)

    However according the same wiki page PCI-e v4.0 "Final specifications are expected to be released in 2017."

    Really have no idea how they are going to provide more than 1GB/s data transfer speed over PCI-e v3. Those disk will be with SAS interface so main bottleneck will not even on PCI but SAS layer.

    Can someone explain this?

    1. Anonymous Coward
      Anonymous Coward

      The article says "dual-port SAS". If it were SAS-3 then even a single port is 12Gbps (1.5GB/s)

      As well as potentially doubling throughput, dual-port gives some interesting potential applications for clustering and failover.

      As for PCIe/NVMe: current drives connect with 2 or 4 lanes, so with PCIe v3 you get either 2GB/sec or 4GB/sec. For the full explanation see

      http://www.theregister.co.uk/2015/07/10/feature_pcie_ssd_for_consumers/

  3. Anonymous Coward
    Anonymous Coward

    I assume this is a case of 'if you need to ask the price you can't afford it'.

    By now they should be getting the price of these things down to the realm of normal spinning disks, after all there isn't the precision engineering needed with them being all solid state.

    1. John Geek
      Facepalm

      yeah, no precision engineering required in fabricating gigabits of flash out of 22 nm on a 12" wafer, no precision at all.

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