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Thread: Unable to mount raid

  1. #1
    Join Date
    Nov 2012
    Beans
    105

    Unable to mount raid

    I'm running ubuntu 20.04.
    I recently set up pair of a WD 4T usb hard drives as a raid1. I can no longer mount the raid.
    After working fine for two weeks, an hour ago I started to be I/O errors when I tried to read files. The lights on the front of the drives that come on when the drive is powered up and connected went off. The drives are plugged in to a power strip on the floor under my desk, and I think I accidentally stepped on the on/off switch, powering down the drives.
    The strange thing is that I was able to list the directories, even when the drives were powered down!
    I powered up the drives; no improvement.
    I powered off the computer, checked the usb connections, and rebooted. The machine took a long time to reboot. When it finally booted successfully, the raid was not mounted.
    I tried to mount the drive and got an error:
    >mount /mnt/data
    mount: /mnt/data: special device /dev/md127p1 does not exist.

    Here's the result of lsblk:
    >lsblk
    NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
    loop0 7:0 0 162M 1 loop /snap/chromium/1320
    loop1 7:1 0 240M 1 loop /snap/chromium/1328
    loop2 7:2 0 255.6M 1 loop /snap/gnome-3-34-1804/36
    loop3 7:3 0 97.1M 1 loop /snap/core/9993
    loop4 7:4 0 96.6M 1 loop /snap/core/9804
    loop5 7:5 0 260.7M 1 loop /snap/kde-frameworks-5-core18/32
    loop6 7:6 0 55M 1 loop /snap/core18/1880
    loop7 7:7 0 55.3M 1 loop /snap/core18/1885
    loop8 7:8 0 62.1M 1 loop /snap/gtk-common-themes/1506
    loop9 7:9 0 30.3M 1 loop /snap/snapd/9279
    loop10 7:10 0 29.9M 1 loop /snap/snapd/8790
    loop11 7:11 0 217.9M 1 loop /snap/gnome-3-34-1804/60
    loop12 7:12 0 177.8M 1 loop /snap/digikam/12
    sda 8:0 0 223.6G 0 disk
    ├─sda1 8:1 0 243M 0 part
    ├─sda2 8:2 0 1K 0 part
    └─sda5 8:5 0 223.3G 0 part
    ├─ubuntu-root 253:2 0 191.6G 0 lvm /mnt/hd1
    └─ubuntu-swap_1 253:3 0 31.7G 0 lvm [SWAP]
    sdb 8:16 0 59.6G 0 disk
    ├─sdb1 8:17 0 512M 0 part /boot/efi
    ├─sdb2 8:18 0 1K 0 part
    └─sdb5 8:21 0 59.1G 0 part
    ├─vgubuntu-root 253:0 0 58.2G 0 lvm /
    └─vgubuntu-swap_1 253:1 0 980M 0 lvm [SWAP]
    sdc 8:32 0 1.8T 0 disk
    └─sdc1 8:33 0 1.8T 0 part
    └─md0 9:0 0 1.8T 0 raid1 /mnt/hd2
    sdd 8:48 0 1.8T 0 disk
    └─sdd1 8:49 0 1.8T 0 part
    └─md0 9:0 0 1.8T 0 raid1 /mnt/hd2
    sde 8:64 0 3.7T 0 disk
    └─sde1 8:65 0 3.7T 0 part
    └─md1 9:1 0 3.7T 0 raid1
    └─md1p1 259:1 0 3.7T 0 part
    sdf 8:80 0 3.7T 0 disk
    └─sdf1 8:81 0 3.7T 0 part
    └─md1 9:1 0 3.7T 0 raid1
    └─md1p1 259:1 0 3.7T 0 part
    sr0 11:0 1 1024M 0 rom

    Here's /etc/fstab:

    # /etc/fstab: static file system information.
    #
    # Use 'blkid' to print the universally unique identifier for a
    # device; this may be used with UUID= as a more robust way to name devices
    # that works even if disks are added and removed. See fstab(5).
    #
    # <file system> <mount point> <type> <options> <dump> <pass>
    /dev/mapper/vgubuntu-root / ext4 errors=remount-ro 0 1
    # /boot/efi was on /dev/sdb1 during installation
    UUID=CBFC-3D4C /boot/efi vfat umask=0077 0 1
    /dev/mapper/ubuntu-swap_1 none swap sw 0 0
    /dev/mapper/vgubuntu-swap_1 none swap sw 0 0
    UUID=7a420995-9611-46f9-8e1f-d177783b5794 /mnt/hd1 ext4 defaults 0 2
    /dev/md127p1 /mnt/data ext4 defaults 0 0
    /dev/md0 /mnt/hd2 ext4 defaults 0 0

    Here's the information on the drives displayed by gparted, plus the same info for the internal drives sdc and sdd that are mounted also mounted as a raid1:
    Partition Name File System Mount Point Label Size Used Unused Flags
    /dev/sdc1 linux-raid /dev/md0 cavu:0 1.82 TiB -- --
    /dev/sdd1 linux-raid /dev/md0 cavu:0 1.82TiB -- --
    /dev/sde1 Elements linux-raid /dev/md1 cavu:1 3.64 TiB -- -- msftdata
    /dev/sdf1 Elements linux-raid /dev/md1 cavu:1 3.64 TiB -- -- msftdata

    Is the msftdata flag the problem? Would it help to remove it?
    Help!

  2. #2
    Join Date
    Oct 2020
    Beans
    113

    Re: Unable to mount raid

    I have had some luck using mdadm...

    never mind - just noticed the thread is SOLVED

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