Greenliant, a developer of special-purpose NAND-flash storage devices, this week introduced its new lineup of ultra-high endurance SSDs. The NANDrive SSDs are aimed at write-intensive industrial applications, and utilize the company’s proprietary EnduroSLC technology and in-house controllers.

Greenliant’s NANDrive SSDs offer endurance ratings of of 50K, 100K, or 250K per-cell program/erase (P/E) cycles, which is well beyond everything offered by "conventional" NAND flash memory manufactured today (SLC is typically rated for ~100K, MLC ~10k, and TLC ~3k).

Right now, the only other storage solutions from Greenliant that offer 250K P/E cycles are their GLS85VM eMMC 5.1, which are available at up to 32GB capacities and offer sequential performance of up to 185 MB/s reads and 140 MB/s writes in HS400 mode. The drives are designed to operate at industrial temperatures between -40°C and +85°C, so they can address virtually any type of application.

Typically, SLC NAND is rated for 100K P/E cycles, but Micron and Sun introduced SLC NAND rated for a million of P/E cycles almost exactly 10 years ago. Companies like Samsung and Toshiba these days offer enterprise-grade Z-NAND and XL-Flash memory that is designed to physically withstand tens of thousands of P/E cycles while offering high performance.

Greenliant does not make its own memory dies, so the EnduroSLC tech allegedly uses enterprise-grade NAND chips produced by an unnamed manufacturer. The company does not disclose a lot of information about its technologies, but as far as we can tell, Greenliant uses a lot redundant raw NAND memory along with a special in-house-designed controller supporting an elaborate feature set and sophisticated algorithms.

Greenliant’s GLS85VM eMMC 5.1 NANDrive SSDs with endurance of 50K, 100K, and 250K P/E cycles are currently available to select customers with select product engagements.

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Source: Greenliant

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  • MrSpadge - Tuesday, December 11, 2018 - link

    You misread the text:
    "Right now, the only other storage solutions from Greenliant that offer 250K P/E cycles are their GLS85VM eMMC 5.1..."

    I.e. besides this new "NANDrive" SSD with unpublished specs they only have one other product with 250k P/E cycles and that's this eMMC solution. It's not slow because of SLC, but becuase of eMMC and lacking parallelism. SLC is always faster than MLC etc.
    Reply
  • Amandtec - Wednesday, December 12, 2018 - link

    They have both DRAM and SLC caches. For regular productivity and games usage these are almost always available. Only if you *say* copy your steam folder once a day or work with TB files do you have to worry. If you do, Optane an option, but you must pay its higher price. Reply
  • Spunjji - Wednesday, December 12, 2018 - link

    This. I don't understand why people complain about cache sizes when it's invariably only a problem in benchmarks. For the edge cases where that's not true, congratulations, the solution to the problem was always going to involve spending more money (RAID array / better quality flash / both). Reply
  • PeachNCream - Tuesday, December 11, 2018 - link

    SLC with decent capacity! I have a Stream 11 with 2GB of RAM and 32GB of eMMC on one of those old Bay Trail processors. It didn't have enough storage space with Windows, but under Linux Mint there's enough space for the OS, programs, and a fair number of files. Something with reasonable endurance like this would be just enough capacity to support a computer like that, but I suspect that the per GB price is too high for budget systems like the Stream series. A pity because the 250K P/E is really exciting. It's still not the same as those old VIA C3 and C7 based thin clients' solid state storage (converting one to run TinyCore was a fun project) as the NAND in those was rated to even higher endurance but storage was limited to well under a single gigabyte, but it is nice to see some sanity in the NAND storage market remains. Reply
  • Spunjji - Wednesday, December 12, 2018 - link

    What I genuinely don't understand is why a system like that needs high endurance. Surely it's not going to spend a lot of time on intensive writes to the system drive? Reply
  • PeachNCream - Wednesday, December 12, 2018 - link

    The shortage of RAM sometimes causes a system like this to spill over into swap which is fairly write intensive. At the moment, I'm using a 4GB SD card mounted as the system swap file to keep writes off the internal eMMC. Modern versions of the Stream 11 are equipped with 4GB of RAM which, based on my experience with an older C2D outfitted with 4GB of DDR2, isn't even quite enough to compensate for swap activity though the workload can be a bit heavier before the system resorts to swap. Although even my workload is relatively light (web browsing, playing music, a few mostly text based Linux friendly games) there's a surprisingly high amount of write activity. Web browsers are the worst for that. Chrome-based browsers can easily write a dozen GB as they cache and display websites during the course of any normal day. Firefox is better since its easy to redirect the cache to RAM, but not everyone knows how to do that. Logging, patches, updates, changing file attributes as each file is accessed, all of those add up to a substantial amount of disk activity the end user doesn't see and usually fails to account for when coming up with back-of-napkin estimates of how long their SSDs will last. Reply
  • IntelUser2000 - Thursday, December 13, 2018 - link

    I really think you are being paranoid with endurance, even with QLC.

    Besides, Stream 11 costs little as it does because it has cheap components. You are not going to see high endurance SLC in there ever.
    Reply
  • PeachNCream - Thursday, December 13, 2018 - link

    Yup, I mentioned that cost thing a couple of posts up and agree it would be unrealistic to see SLC in low cost systems. As for paranoia, maybe I am, but I've killed a few SSDs already...planar MLC mind you, but it isn't exactly difficult to expend the endurance of a drive in fairly modest workloads. Reply

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