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Khobayachi's avatar
Khobayachi
Aspirant
Jan 03, 2019
Solved

Readynas RNDU6000 says "Volume data is degraded", no errors in disk status

Hi, I have a Readynas Ultra 6 (RNDU6000). On the NAS screen and on the admin page, it says "DEGRADED" for a few weeks. The Volumes tab shows one volume, Data, with 6 disks. WHen I roll over each ...
  • StephenB's avatar
    StephenB
    Jan 08, 2019

    As far as disk health goes - you might want to repeat those tests, but this time run the destructive "write zeros" test.  I've found that will pick up issues that the non destructive tests miss.

     

    The easiest way to test the SATA backplane is to do a factory reset with only one disk installed in slot 1.  When that completes, make sure you can read/write to the data volume, and of course look at the log for any problems. Then power down the NAS, and move that disk to slot 2.  Power up, and make sure the system boots and still functions normally.  Repeat that until you have tested all 6 slots.

     

     

    Another possibility is that you have a failing power supply - not always able to provide adequate power to all the disks.  A memory failure can of course also create all kinds of weird symptoms, but I won't expect it to only affect the mounting of the RAID array.