Please help - Missing file system after power outage

1st Official Post

    Hi.


    Power went off for a couple of hours and when back, I see one of the filesystems is missing ||





    Output of xmlstarlet sel -t -c "//fstab" /etc/openmediavault/config.xml



    Any ideas would be very welcomed!

    • Official Post
    Quote from vazquezjm

    Any ideas would be very welcomed

    This might be a corrupted file system due to the power outage, you could try mount -a from the cli, if that doesn't do anything then you may have to research fixing a btrfs file system.


    On an EXT4 drive one would run fsck on an unmounted drive to fix file system errors.

    Raid is not a backup! Would you go skydiving without a parachute?


    OMV 6x amd64 running on an HP N54L Microserver

    More on this


    Result of lsblk

    Code
    NAME   MAJ:MIN RM   SIZE RO TYPE MOUNTPOINT
sda      8:0    0 223.6G  0 disk
├─sda1   8:1    0   512M  0 part /boot/efi
├─sda2   8:2    0 222.1G  0 part /
└─sda3   8:3    0   976M  0 part [SWAP]
sdb      8:16   0   3.6T  0 disk
sdc      8:32   0   3.6T  0 disk
└─sdc1   8:33   0   3.6T  0 part /srv/dev-disk-by-uuid-6a63fabf-9982-4444-a9c3-6d477d2c26f7


    Result of fdisk -l /dev/sdb

    Code
    Disk /dev/sdb: 3.64 TiB, 4000787030016 bytes, 7814037168 sectors
Disk model: WDC WD40EFAX-68J
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes


    Result of fdisk -l /dev/sdc


    Code
    Disk /dev/sdc: 3.64 TiB, 4000787030016 bytes, 7814037168 sectors
Disk model: WDC WD40EFAX-68J
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disklabel type: gpt
Disk identifier: 16D5CD82-FFDB-44A0-BDCA-9780250747DF

Device     Start        End    Sectors  Size Type
/dev/sdc1   2048 7814037134 7814035087  3.6T Linux filesystem


    What's the difference between fdisk outputs? Also for lsblk? Is the disk unmounted?

    Quote from vazquezjm

    What's the difference between fdisk outputs? Also for lsblk? Is the disk unmounted?

    The difference is that your disk sdb lost it's partition table.
    fdisk doesn't recognize it, at least.

    If it was unmounted it would show something like this on lsblk:

    Code
    pi@xxxxxx:~ $ lsblk
NAME   MAJ:MIN RM   SIZE RO TYPE MOUNTPOINT
sda      8:0    0   3.6T  0 disk
└─sda1   8:1    0   3.6T  0 part /srv/dev-disk-by-label-wolf1
sdb      8:16   0   3.6T  0 disk
└─sdb1   8:17   0   3.6T  0 part


    As for fdisk, it would show the same as the other since they're both the same Brand and Model:

    Something like this:


    The sad news is that your disk has lost it's partition table.

    This is the same as a blank disk brand new that wasn't even initialized.


    Since you gave few to none info, now the question:

    Do you have a backup of the DATA that existed there?

    Thank you Soma and geaves !


    For some reason, I'm not receiving email notifications for forum posts.


    I tried a couple of things I don't even remember now. The truth is sdb was unmounted as you said, so I went ahead and mounted it from the UI.


    Thankfully, nothing was lost and mergerfs started flawlessly after that.

    Quote from Soma

    Do you have a backup of the DATA that existed there?

    Since I was able to recover from failure, I have two topics to investigate now:

    • Backups (I'm using UrBackup for my PCs, which data lives on the Union FS)
    • How to shutdown the system from a remote host (which has a UPS attached to it)
    • Official Post
    Quote from vazquezjm

    Backups (I'm using UrBackup for my PCs, which data lives on the Union FS)

    Not something I would do, I would direct the backups to a single drive, how have you deployed UrBackup, I'm asking because I did set mine up in docker, then I think it was macom said that he deploys his directly on OMV and it runs as a service. I have done this and I find it more intuitive than the docker version.

    Quote from vazquezjm

    How to shutdown the system from a remote host (which has a UPS attached to it)

    Pass probably Soma territory that one :)

    Check the guides section.

    There's a nut plugin guide from chente


    Might give you a solution

    Quote from geaves

    Not something I would do, I would direct the backups to a single drive, how have you deployed UrBackup, I'm asking because I did set mine up in docker, then I think it was macom said that he deploys his directly on OMV and it runs as a service. I have done this and I find it more intuitive than the docker version.

    I've using UrBackup for more than a year now (Docker) and very used to it. When I migrated to OMV, I kept using the Docker version and no problems whatsoever.


    Quote from Soma

    Check the guides section.

    There's a nut plugin guide from chente


    Might give you a solution

    Will try that.


    I'm running Home Assistant on a separate host and I automate the shutdown of it based on certain thresholds. Ideally, when the power goes off, I'd shut down OMV gracefully not to have these problems.

    If the UPS system is the HA, I can't help you since I don't know how it runs.

    If it has nut on it (which should have or similar program) then you need to configure it to have remote monitoring available.


    If both instances run on OMV than it's as easy as (with the openmediavault-nut plugin)

    Configure the instance with the UPS as Standalone and set the grace period as you see fit (I have on UPS reaches low battery setting).

    Enable remote monitoring on it and set a user:password (don't use a USER of the system, this is only for UPS monitoring) on the proper field.


    Enable the plugin on the remote system as a Netclient and set all required fields to match the UPS server.

    Set the grace period as you see fit.

    Don't enable remote monitoring.


    When power goes down, system will shutdown in according to the set grace period of each system individually.

    This is in the guide I talked about:

    [How-to] Use the openmediavault-nut plugin - Guides - openmediavault

    Quote from vazquezjm

    I guess it should work ;)


    Yes, it should.

    Then configure the remote monitoring on it.
    Maybe the "slave" meaning in there.

    You'll need to find that on the HA forums/support or maybe someone who is already using (HA) can give an input on how to set it.

    Good luck

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