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Alternatives

Several NAS vendors besides Synology and Buffalo include QNAP, Asustor, TerraMaster, WD,
and their products get higher ratings than Synology in some tests,
but some of those articles then suggest replacing their proprietary NAS OS with e.g. FreeNAS or TrueNAS.
Perhaps those may be nearly turn-key, but my Linux distro experience does not encourage that expectation.

NAS OS:  Synology DSM 7.2

See:  Hints, tricks, DSM installation   https://finds.synology.com/

NAS:  Synology 4 Bay NAS DiskStation DS920+


Press release  -   review   techradar review   4GB DDR4 PC4-21300, 2666MHZ CL 19 DRAM upgrade
  Its Intel Celeron J4125 quad-core SoC has a DDR4/LPDDR4 memory controller (dual-channel, up to 2400 MHz).
  Matched DRAMs allow it to operate in dual channel mode, which in most realistic scenarios is most important.

Power down

  • DS920+ powers up as soon as plugged in
  • To power off, press and hold power button until beep and blinking power indicator, then release
  • DS920+ will go thru shutdown and power off gracefully.

      Data Sheet (specifications):


      Knowledge Center   -   Download Center

    Condition:  Used
    Item:  195787012100

    Note: Ac adapter and drive lock keys are missing.

    Up for sale is a used Synology 4 Bay NAS DiskStation DS920+ w/4x 4TB Drives!
    Unit has been tested and verified to be in good working order.
    Hard drives have been wiped and will need to be reformatted before use.
    AC adapter and drive lock keys are missing.  No other accessories are included.

    45-Day Warranty


    4 days after order, thanks to Memorial Day weekend, vendor cascade-assets shipped by Fedex.

    Hardware configuration considerations

    Received 3 Jun 2023;  see Grim Reality for actual installation log.   -   Hardware Installation Guide (23 pages)

    PC mag review:  "I let the verification process run overnight"

    Running a Synology DS920+ memory test
    mr2686:  A great NAS so far
    I had been unclear about using BTRFS filesystem, but it's really cool and recommended.
    When you do, make sure you have the checksum box checked otherwise you won't be able to do a data scrub
    which will help fix any data bits from flipping (data rot)(also, you cannot turn checksum on after the fact.
    You would need to create a new shared folder and start from scratch.
    Also, I initially was getting fairly slow transfer speeds when moving my data over to this new box,
    but again I found a video that suggested I uncheck "enable memory compression".
    Once unchecked, I got full gigabit transfer rates.

    GitHub:  script for NVMe Volume on Synology 920+

    SSD volume on a Synology 920+ using NVMe slots

    SynoForum.com unofficial Synology NAS owners forum  -  Tutorials

    Synology DS920+ compatibility lists

    Some link aggregation requires a managed switch, ideally with 2.5G port(s)

  • e.g. Zyxel XGS1210-12, $179 at Amazon   -   User's Guide
  • DSM Adaptive Load Balancing works with dumb switches;  a simple 5-port switch with 2.5G uplink could exploit 2.5G MoCA bridges.

    Hard drive reliability:  1.54% annualized failure rate, per Backblaze

    For 4 drives, that translates to 22% likelihood at least one will fail within 4 years;
    this encourages sacrificing one for protection, AKA RAID 5 or Synology SHR 1.

    Synology RAID Calculator: SHR vs. RAID

    SHR compares somewhat to RAID 5:
    • if all drives are the same size, one gets used for protection
    • if one is larger, the amount by which it is larger than the smallest (RAID 5) or next largest (SHR) gets wasted
    • if one is smaller, that size is the only amount used from each drive by RAID 5
    • SHR protection size is lesser of 2 largest drives.
    • A visual aid to SHR stripe redundancy:

    eject USB drive

    Synology NAS hard drive health
    There are really no other tests other then S.M.A.R.T.,
    which won't catch mechanical problems for instance.
    The Storage Manager will show the SMART status of each disk.
    Log into the web interface and go to Main Menu > Storage Manager > HDD Management.

    Test Scheduler Option on this screen can also schedule a more in-depth SMART test.

    WunderTech:  Monitoring NAS Hard Drives for Bad Sectors



    29 May 2029

    KFD 100W 4-pin power adapter for Synology 4-Bay NAS

    DS920+ was not listed, but 100W,
    which is its Synology replacement rating.

    30 May 2023

    CyberPower CP750LCD W/New Batteries

     Condition:  Used
    Item:  402693624661
    Part # CP750LCD

    Tested - CyberPower | CP750LCD | Intelligent LCD 750VA/420W Desktop UPS W/New Batteries
    Condition for each will resemble the photo.
    Will be professionally packaged for shipment.


    Amazon customer reviews

    2 Jun 2023:
    Received wrapped in heavy plastic bag inside form-fitting foam.  Battery initially reported 100% capacity,
    but quickly dropped to 73% when unplugged with 23 Watt load (Nikon microscope illuminator).
    Alarm is neither loud nor constant;  unlikely to be heard from another room...
    After allowing it to fully recharge, battery cap immediately dropped to 61% after unplugging with the same load.

    Sadly, outlets are oriented wrong for my router, modem and MoCA bridge wall warts, complicating connections:

    Synology NAS Drive Bay Key

    Condition:  New
    Item:  325649533792

    Set of two Drive Bay Keys for virtually all Synology Drive types
  • made of a durable material and with a hole for keychain or string
  • 3D Printed from a durable composite
  • Available in Black
    • maintained by blekenbleu