Western Digital recently announced new data center HDDs that increase Shingled Magnetic Recording (SMR) capacity to 32TB and Conventional Magnetic Recording (CMR) capacity to 26TB. The company...
  • Zachariah@lemmy.worldEnglish
    0·
    4 months ago

    I’ve been looking to buy a couple 24TB drives. Hopefully, this pushes their price down.

  • addie@feddit.ukEnglish
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    4 months ago

    Assuming that these have fairly impressive 100 MB/s sustained write speed, then it’s going to take about 93 hours to write the whole contents of the disk - basically four days. That’s a long time to replace a failed drive in a RAID array; you’d need to consider multiple disks of redundancy just in case another one fails while you’re resilvering the first.

    • DaPorkchop_@lemmy.mlEnglish
      1·
      4 months ago

      My 16TB ultrastars get upwards of 180MB/s sustained read and write, these will presumably be faster than that as the density is higher.

      • frezik@midwest.socialEnglish
        1·
        4 months ago

        I’m guessing that only works if the file is smaller than the RAM cache of the drives. Transfer a file that’s bigger than that, and it will go fast at first, but then fill the cache and the rate starts to drop closer to 100 MB/s.

        My data hoarder drives are a pair of WD ultrastar 18TB SAS drives on RAID1, and that’s how they tend to behave.

        • DaPorkchop_@lemmy.mlEnglish
          1·
          4 months ago

          This is for very long sustained writes, like 40TiB at a time. I can’t say I’ve ever noticed any slowdown, but I’ll keep a closer eye on it next time I do another huge copy. I’ve also never seen any kind of noticeable slowdown on my 4 8TB SATA WD golds, although they only get to about 150MB/s each.

          EDIT: The effect would be obvious pretty fast at even moderate write speeds, I’ve never seen a drive with more than a GB of cache. My 16TB drives have 256MB, and the 8TB drives only 64MB of cache.

  • Ugurcan@lemmy.worldEnglish
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    4 months ago

    If you eyeballing these, please remind that these babies tend to be LOUD AS FUCK, so might not be suitable for home server use.

    • Jarix@lemmy.worldEnglish
      1·
      4 months ago

      Are they any louder than any HDD from the last 30 years?

      If so, im actually curious why that is

      Edit: fixed to say HDD not SSD

      • Ugurcan@lemmy.worldEnglish
        0·
        4 months ago

        Oops, yes. I definitely would expect these to be much louder than your 6 GB 1998 model HDD wrangling under stress of copying files at 30 MB/s.

        • MonkderVierte@lemmy.mlEnglish
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          4 months ago

          Your everyday modern HDD does not much more than 60MB/s after the on-disk cache (a few GB) is full.

          • DaPorkchop_@lemmy.mlEnglish
            0·
            4 months ago

            not sure what you’re on about, i have some cheap 500GB USB 3 drives from like 2016 lying around and even those can happily deal with sustained writes over 130MB/s.

            • frezik@midwest.socialEnglish
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              4 months ago

              When the cache isn’t full, yes, that’s true. Copy a file that’s significantly bigger than cache and performance will drop part way through.

              • DaPorkchop_@lemmy.mlEnglish
                1·
                4 months ago

                You’ve made me uncertain if I’ve somehow never noticed this before, so I gave it a shot. I’ve been dd-ing /dev/random onto one of those drives for the last 20 minutes and the transfer rate has only dropped by about 4MB/s since I started, which is about the kind of slowdown I would expect as the drive head gets closer to the center of the platter.

                EDIT: I’ve now been doing 1.2GB/s onto an 8 drive RAID0 (8x 600GB 15k SAS Seagates) for over 10 minutes with no noticable slowdown. That comes out to 150MB/s per drive, and these drives are from 2014 or 2015. If you’re only getting 60MB/s on a modern non-SMR HDD, especially something as dense as an 18TB drive, you’ve either configured something wrong or your hardware is broken.

    • varyingExpertise@feddit.orgEnglish
      0·
      4 months ago

      I’ve found that the only thing you can hear through a closed basement door are noisy high speed fans, e.g. from used 19" servers, disks produce much less noise.

        • varyingExpertise@feddit.orgEnglish
          1·
          4 months ago

          Nah, I’m living outside the US, my home is made from proper bricks and concrete. A bit slower to build but rather good when it comes to sound insulation. I could imagine with those strand board walls that might be a problem though.