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dstsui's avatar
dstsui
Aspirant
Apr 28, 2021

RN102 broken after OS 6.10.4 update

My RN102 appears to be broken after updated to 6.10.4. Not sure which came first, I updated the OS to 6.10.4 and noticed very slow transfer speed when I copied hundreds of JPEG images from the SD car...
mdgm's avatar
mdgm
Virtuoso
Apr 29, 2021
mdstat.log shows info on the RAID levels more concisely

md0 is the 4GB root volume and uses RAID-1. The system will still boot if a disk is removed however any RAID-0 data volume using that disk won’t be able to be mounted as the RAID array won’t be able to be started.
dstsui's avatar
dstsui
Aspirant
Apr 29, 2021
/dev/md/data-0:
           Version : 1.2
     Creation Time : Sun Jan 11 06:16:09 2015
        Raid Level : raid1
        Array Size : 1948662784 (1858.39 GiB 1995.43 GB)
     Used Dev Size : 1948662784 (1858.39 GiB 1995.43 GB)
      Raid Devices : 2
     Total Devices : 2
       Persistence : Superblock is persistent

     Intent Bitmap : Internal

       Update Time : Thu Apr 29 07:28:54 2021
             State : clean 
    Active Devices : 2
   Working Devices : 2
    Failed Devices : 0
     Spare Devices : 0

Consistency Policy : unknown

              Name : 0e361c14:data-0  (local to host 0e361c14)
              UUID : 93079119:a9de47f1:0351ef69:148df03c
            Events : 5138

    Number   Major   Minor   RaidDevice State
       0       8        3        0      active sync   /dev/sda3
       1       8       19        1      active sync   /dev/sdb3

If md127 is indeed the data volume, then everything looks good to me:

 

  • mdgm's avatar
    mdgm
    Virtuoso
    Apr 30, 2021

    Yes, md127 is the data volume and in your case it's using RAID-1.

    If there were multiple volumes or multiple RAID layers for a volume then you'd see other RAID arrays like md126 etc.

     

    md0 is the 4GB root volume

    md1 is the swap

    Note that with RAID-1 you can still have issues like filesystem corruption, accidental file deletion etc.

    RAID doesn't replace the need for backups. No important data should be stored on just the one device.

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