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Forum Discussion

as_'s avatar
as_
Aspirant
Nov 11, 2021

The volume data encountered an error and was made read-only. It is recommended to backup your data.

Was copying data onto my NAS from external hard drives for backup purposes (just had an external drive fail.. so.. I'm a bit paranoid on that right now..). All of a sudden, I couldn't transfer files ...
as_'s avatar
as_
Aspirant
Nov 11, 2021

No, I have not.  Most of the data on the NAS is data I have stored on other local drives.. but not all of it.

StephenB's avatar
StephenB
Guru - Experienced User
Nov 11, 2021
as_ wrote:

No, I have not.  Most of the data on the NAS is data I have stored on other local drives.. but not all of it.

Data loss is very possible (and reformatting/starting over is in fact the simplest way to proceed).  So it'd be good to back up everything you care about first.

  • as_'s avatar
    as_
    Aspirant
    Nov 11, 2021

    I'll start there with the backup.. but that said, we're talking about 20TB of data (4x8TB drives).  Formatting the drive and starting over is absolutely the last thing I want to do.

    • as_'s avatar
      as_
      Aspirant
      Nov 11, 2021

      Digging a little deeper (figured out how to download the detailed log files).. I see the following in kernel.log (repeated several times for each message):

      kernel: BTRFS error (device md127): bad tree block start 14701692634252692971 23322242252800
kernel: BTRFS error (device md127): bad tree block start 18115770242137751560 23322241466368
kernel: BTRFS error (device md127): parent transid verify failed on 23363584 wanted 3050091 found 3050089
      • rn_enthusiast's avatar
        rn_enthusiast
        Virtuoso
        Nov 12, 2021

        The filesystem is damaged here, which you have found out. That is the reason for the NAS remonting to prevent any further corruption.

         

        Are you OK to send me the logs? I wouldn't mind poking around in them and see where we go from here.

         

        When you access the NAS Admin web page, go to: System > Logs and here you will see a button called "Download Logs" on the right-hand side. Click this and it will download a zip file with all the NAS logs inside.

         

        Take this zip file and upload to your Dropbox, Google Drive or similar and then make a link where I can download the log zip file. PM me this link please. Then I will have a look to see what is going on.

         

         

        Cheers

         

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