Raid not mounting

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    • Raid not mounting

      Can somebody help a Noob please?
      By accident I stupidly followed an upgrade which ended up with me upgrading to version 4. I would be happy to downgrade back to 3.x if I can without wiping my Raid and getting it to work again as this has some data on it.

      Currently I see the raid shown in the Raid management screen but not on the file systems where it just shows missing.

      Display Spoiler

      root@Hostname-NAS:~# cat /proc//mdstat
      Personalities : [raid10] [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4]
      md0 : active (auto-read-only) raid10 sda[0] sde[4](S) sdd[3] sdc[2] sdb[1]
      1953262592 blocks super 1.2 512K chunks 2 near-copies [4/4] [UUUU]
      unused devices: <none>
      root@Hostname-NAS:~# blkid
      /dev/sda: UUID="bb4a59c9-e27c-3eff-382f-ed361b1e9a26" UUID_SUB="a00e7c38-6750-8771-f57d-43475a3a6ad6" LABEL="openmediavault:Hostname" TYPE="linux_raid_member"
      /dev/sdb: UUID="bb4a59c9-e27c-3eff-382f-ed361b1e9a26" UUID_SUB="8693c07f-25cb-4a75-7f14-c76119bb746c" LABEL="openmediavault:Hostname" TYPE="linux_raid_member"
      /dev/sdc: UUID="bb4a59c9-e27c-3eff-382f-ed361b1e9a26" UUID_SUB="a0843881-b205-2390-e0df-001e9f6b6f15" LABEL="openmediavault:Hostname" TYPE="linux_raid_member"
      /dev/sdd: UUID="bb4a59c9-e27c-3eff-382f-ed361b1e9a26" UUID_SUB="d1f5e392-25c6-2251-290b-d6325ba6ab79" LABEL="openmediavault:Hostname" TYPE="linux_raid_member"
      /dev/sde: UUID="bb4a59c9-e27c-3eff-382f-ed361b1e9a26" UUID_SUB="ee42741b-6661-becc-b2e6-947c05ac5dad" LABEL="openmediavault:Hostname" TYPE="linux_raid_member"
      /dev/sdf1: UUID="f71d3d0c-95e9-4ec8-99fa-65c708fc5b04" TYPE="ext4" PARTUUID="0009afc7-01"
      /dev/sdf5: UUID="d98e379a-4c82-414e-b841-18c0010783bf" TYPE="swap" PARTUUID="0009afc7-05"
      root@Hostname-NAS:~# fdisk -l | grep "Disk "
      Disk /dev/sda: 931.5 GiB, 1000204886016 bytes, 1953525168 sectors
      Disk /dev/sdb: 931.5 GiB, 1000204886016 bytes, 1953525168 sectors
      Disk /dev/sdc: 931.5 GiB, 1000204886016 bytes, 1953525168 sectors
      Disk /dev/md0: 1.8 TiB, 2000140894208 bytes, 3906525184 sectors
      Disk /dev/sdd: 931.5 GiB, 1000204886016 bytes, 1953525168 sectors
      Disk /dev/sde: 931.5 GiB, 1000204886016 bytes, 1953525168 sectors
      Disk /dev/sdf: 55.9 GiB, 60022480896 bytes, 117231408 sectors
      Disk identifier: 0x0009afc7
      root@Hostname-NAS:~# cat /etc/mdadm/mdadm.conf
      # mdadm.conf
      # Please refer to mdadm.conf(5) for information about this file.

      # by default, scan all partitions (/proc/partitions) for MD superblocks.
      # alternatively, specify devices to scan, using wildcards if desired.
      # Note, if no DEVICE line is present, then "DEVICE partitions" is assumed.
      # To avoid the auto-assembly of RAID devices a pattern that CAN'T match is
      # used if no RAID devices are configured.
      DEVICE partitions

      # auto-create devices with Debian standard permissions
      CREATE owner=root group=disk mode=0660 auto=yes

      # automatically tag new arrays as belonging to the local system
      HOMEHOST <system>

      # definitions of existing MD arrays
      ARRAY /dev/md0 metadata=1.2 spares=1 name=openmediavault:Hostname UUID=bb4a59c9:e27c3eff:382fed36:1b1e9a26
      root@Hostname-NAS:~# dadm --detail --scan --verbos
      -bash: dadm: command not found
      root@Hostname-NAS:~# mdadm --detail --scan --verbose
      ARRAY /dev/md0 level=raid10 num-devices=4 metadata=1.2 spares=1 name=openmediavault:Hostname UUID=bb4a59c9:e27c3eff:382fed36:1b1e9a26
      root@Hostname-NAS:~# modprobe raid10
      root@Hostname-NAS:~# lsmod | grep raid
      raid456 106496 0
      async_raid6_recov 20480 1 raid456
      async_memcpy 16384 2 raid456,async_raid6_recov
      async_pq 16384 2 raid456,async_raid6_recov
      async_xor 16384 3 async_pq,raid456,async_raid6_recov
      async_tx 16384 5 async_xor,async_pq,raid456,async_memcpy,async_raid6_recov
      raid6_pq 110592 4 async_pq,btrfs,raid456,async_raid6_recov
      libcrc32c 16384 1 raid456
      raid1 36864 0
      raid0 20480 0
      raid10 49152 1

      md_mod 131072 6 raid1,raid10,multipath,linear,raid0,raid456

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    • It's easy to install OMV on a USB thumbdrive and then clone the thumbdrive for OMV/OS backup. With a known working boot drive set off to the side, one can try configuration changes and upgrades without consequence by doing them on a cloned thumbdrive. If the upgrade goes south, simply back out of the upgrade by rebooting on the unaltered original drive.

      If either of you would consider backing up the OS, easy to follow processes are laid out in this guide. It may save you some future grief along these lines.
      Good backup takes the "drama" out of computing
      Primary: OMV 3.0.99, ThinkServer TS140, 12GB ECC, 32GB USB boot, 4TB+4TB zmirror, 3TB client backup.
      Backup: OMV 4.1.9, Acer RC-111, 4GB, 32GB USB boot, 3TB+3TB zmirror, 4TB Rsync'ed disk
      2nd Data Backup: OMV 3.0.99, R-PI 2B, 16GB boot, 4TB WD USB MyPassport - direct connect (no hub)
    • going back to 3.x would be for me the following:

      1. Note down the imporant parts of exported filesystems (Samba config, Storage part, Raid part) - best make screenshots or photos with your mobile.
      2. Shutdown OMV
      3. Pull all Raid Disks - ensure that they are not accessible by the system for the next steps.
      4. Reinstall 3.x and upgrade to latest release.
      5. Reconfigure everything (with the exception of Samba).
      6. Stop OMV again
      7. Put in all raid disks - ensure that you really have all in place)
      8. Start OMV again
      9. Look at the raid panel, find your disk.
      10. resetup the storage parts and reexport the shares.

      That should be it.

      If you are using other Plugins, you need to note down all settings for that as well and if possible do a backup of the settings (e.g. Couchpotato and others). Also you want to create a backup of your running system (not the data disks) to ensure you have all data available you need.
      Everything is possible, sometimes it requires Google to find out how.