openmediavault-sftp plugin: 500 Internal Server Error (Salt deploy fstab failed / device mismatch)

counhopig · Feb 10th 2026

Hi everyone,

I am encountering an issue with the openmediavault-sftp plugin on OMV 8.x.

When I try to apply configuration changes after setting up the SFTP plugin, I get a 500 - Internal Server Error.

System Information:

OMV Version: 8.1.0-1 (Synchrony)
Plugin: openmediavault-sftp 8.0
Kernel: Linux 6.18.5+deb13-amd64

The Error:

The error message suggests a problem with omv-salt deploy run fstab. It seems like Salt is trying to mount a filesystem but failing because of a device mismatch (it expects the UUID on /dev/sdb but sees it on /dev/sda).

Here is the full error trace:

Code

500 - Internal Server Error
Failed to execute command 'export PATH=/bin:/sbin:/usr/bin:/usr/sbin:/usr/local/bin:/usr/local/sbin; export LC_ALL=C.UTF-8; export LANGUAGE=; omv-salt deploy run --no-color fstab 2>&1' with exit code '1': 
debian: ---------- ID: create_filesystem_mountpoint_224b6e51-d55d-41cd-bd84-ef5781bb5b25 Function: file.accumulated Result: True Comment: Accumulator create_filesystem_mountpoint_224b6e51-d55d-41cd-bd84-ef5781bb5b25 for file /etc/fstab was charged by text Started: 11:15:28.752357 Duration: 0.647 ms Changes: ---------- ID: mount_filesystem_mountpoint_224b6e51-d55d-41cd-bd84-ef5781bb5b25 Function: mount.mounted Name: /srv/dev-disk-by-uuid-90f5ba3e-a359-4842-af40-b97774309bb3 Result: False Comment: Unable to unmount Started: 11:15:28.753486 Duration: 35.607 ms Changes: ---------- umount: Forced unmount because devices don't match. Wanted: /dev/disk/by-uuid/90f5ba3e-a359-4842-af40-b97774309bb3 (/dev/sdb), current: /dev/sda, /dev/sda, 90f5ba3e-a359-4842-af40-b97774309bb3 ---------- ID: create_sftp_mountpoint_1c6a4987-380f-4643-a46c-73b163da8714 Function: file.accumulated Result: True Comment: Accumulator create_sftp_mountpoint_1c6a4987-380f-4643-a46c-73b163da8714 for file /etc/fstab was charged by text Started: 11:15:28.789219 Duration: 0.699 ms Changes: ---------- ID: mount_sftp_mountpoint_1c6a4987...

Steps taken so far: I have tried rebooting the server. I checked the disks, and they seem to be mounted correctly in the Storage tab, but the plugin configuration triggers this salt error.

Has anyone experienced this device mismatch issue with the SFTP plugin on OMV 8? Any advice on how to fix the salt state or fstab entry?

Thanks in advance for your help!

ryecoaaron · Feb 10th 2026

The error isn't from the sftp plugin itself. Can you post the entire error? cut&paste from the bell in the top right. Or better just, post all of the output from

sudo omv-salt deploy run fstab

Do you have sharedfolders on the OS drive?

counhopig · Feb 11th 2026

Quote from ryecoaaron

The error isn't from the sftp plugin itself. Can you post the entire error? cut&paste from the bell in the top right. Or better just, post all of the output from

sudo omv-salt deploy run fstab

Do you have sharedfolders on the OS drive?

Sure, here is the error.

Code

Failed to execute command 'export PATH=/bin:/sbin:/usr/bin:/usr/sbin:/usr/local/bin:/usr/local/sbin; export LC_ALL=C.UTF-8; export LANGUAGE=; omv-salt deploy run --no-color fstab 2>&1' with exit code '1': debian:
----------
          ID: create_filesystem_mountpoint_cc52d948-b618-499e-9d3f-37447f7946da
    Function: file.accumulated
      Result: True
     Comment: Accumulator create_filesystem_mountpoint_cc52d948-b618-499e-9d3f-37447f7946da for file /etc/fstab was charged by text
     Started: 11:48:47.235242
    Duration: 0.663 ms
     Changes:
----------
          ID: mount_filesystem_mountpoint_cc52d948-b618-499e-9d3f-37447f7946da
    Function: mount.mounted
        Name: /srv/dev-disk-by-uuid-90f5ba3e-a359-4842-af40-b97774309bb3
      Result: False
     Comment: Unable to unmount
     Started: 11:48:47.236574
    Duration: 58.147 ms
     Changes:
              ----------
              umount:
                  Forced unmount because devices don't match. Wanted: /dev/disk/by-uuid/90f5ba3e-a359-4842-af40-b97774309bb3 (/dev/sda), current: /dev/sdb, /dev/sdb, 90f5ba3e-a359-4842-af40-b97774309bb3
----------
          ID: create_sftp_mountpoint_13adf817-9720-4498-8933-9ed7c1d868a6
    Function: file.accumulated
      Result: True
     Comment: Accumulator create_sftp_mountpoint_13adf817-9720-4498-8933-9ed7c1d868a6 for file /etc/fstab was charged by text
     Started: 11:48:47.294851
    Duration: 0.693 ms
     Changes:
----------
          ID: mount_sftp_mountpoint_13adf817-9720-4498-8933-9ed7c1d868a6
    Function: mount.mounted
        Name: /sftp/kaitak-video-download-user/hoplee-kaitak
      Result: True
     Comment: Target was already mounted
     Started: 11:48:47.295631
    Duration: 19.051 ms
     Changes:
              ----------
              umount:
                  Forced remount because options (ro,subvol=/,subvolid=5) changed
----------
          ID: append_fstab_entries
    Function: file.blockreplace
        Name: /etc/fstab
      Result: True
     Comment: Changes were made
     Started: 11:48:47.316611
    Duration: 9.262 ms
     Changes:
              ----------
              diff:
                  ---
                  +++
                  @@ -17,5 +17,5 @@

                   # >>> [openmediavault]
                   /dev/disk/by-uuid/90f5ba3e-a359-4842-af40-b97774309bb3        /srv/dev-disk-by-uuid-90f5ba3e-a359-4842-af40-b97774309bb3    btrfs    defaults,nofail    0 2
                  -/srv/dev-disk-by-uuid-90f5ba3e-a359-4842-af40-b97774309bb3/hoplee-kaitak/        /sftp/hoplee-kaitak/hoplee-kaitak    none    bind,rw,nofail    0 0
                  +/srv/dev-disk-by-uuid-90f5ba3e-a359-4842-af40-b97774309bb3/hoplee-kaitak/        /sftp/kaitak-video-download-user/hoplee-kaitak    none    bind,ro,nofail    0 0
                   # <<< [openmediavault]
----------
          ID: fstab_systemctl_daemon_reload
    Function: module.run
      Result: True
     Comment: service.systemctl_reload: True
     Started: 11:48:47.327271
    Duration: 302.815 ms
     Changes:
              ----------
              service.systemctl_reload:
                  True

Summary for debian
------------
Succeeded: 5 (changed=4)
Failed:    1
------------
Total states run:     6
Total run time: 390.631 ms
[ERROR   ] Command 'umount' failed with return code: 32
[ERROR   ] stderr: umount: /srv/dev-disk-by-uuid-90f5ba3e-a359-4842-af40-b97774309bb3: target is busy.
[ERROR   ] retcode: 32
[ERROR   ] {'umount': "Forced unmount because devices don't match. Wanted: /dev/disk/by-uuid/90f5ba3e-a359-4842-af40-b97774309bb3 (/dev/sda), current: /dev/sdb, /dev/sdb, 90f5ba3e-a359-4842-af40-b97774309bb3"}

OMV\ExecException: Failed to execute command 'export PATH=/bin:/sbin:/usr/bin:/usr/sbin:/usr/local/bin:/usr/local/sbin; export LC_ALL=C.UTF-8; export LANGUAGE=; omv-salt deploy run --no-color fstab 2>&1' with exit code '1': debian:
----------
          ID: create_filesystem_mountpoint_cc52d948-b618-499e-9d3f-37447f7946da
    Function: file.accumulated
      Result: True
     Comment: Accumulator create_filesystem_mountpoint_cc52d948-b618-499e-9d3f-37447f7946da for file /etc/fstab was charged by text
     Started: 11:48:47.235242
    Duration: 0.663 ms
     Changes:
----------
          ID: mount_filesystem_mountpoint_cc52d948-b618-499e-9d3f-37447f7946da
    Function: mount.mounted
        Name: /srv/dev-disk-by-uuid-90f5ba3e-a359-4842-af40-b97774309bb3
      Result: False
     Comment: Unable to unmount
     Started: 11:48:47.236574
    Duration: 58.147 ms
     Changes:
              ----------
              umount:
                  Forced unmount because devices don't match. Wanted: /dev/disk/by-uuid/90f5ba3e-a359-4842-af40-b97774309bb3 (/dev/sda), current: /dev/sdb, /dev/sdb, 90f5ba3e-a359-4842-af40-b97774309bb3
----------
          ID: create_sftp_mountpoint_13adf817-9720-4498-8933-9ed7c1d868a6
    Function: file.accumulated
      Result: True
     Comment: Accumulator create_sftp_mountpoint_13adf817-9720-4498-8933-9ed7c1d868a6 for file /etc/fstab was charged by text
     Started: 11:48:47.294851
    Duration: 0.693 ms
     Changes:
----------
          ID: mount_sftp_mountpoint_13adf817-9720-4498-8933-9ed7c1d868a6
    Function: mount.mounted
        Name: /sftp/kaitak-video-download-user/hoplee-kaitak
      Result: True
     Comment: Target was already mounted
     Started: 11:48:47.295631
    Duration: 19.051 ms
     Changes:
              ----------
              umount:
                  Forced remount because options (ro,subvol=/,subvolid=5) changed
----------
          ID: append_fstab_entries
    Function: file.blockreplace
        Name: /etc/fstab
      Result: True
     Comment: Changes were made
     Started: 11:48:47.316611
    Duration: 9.262 ms
     Changes:
              ----------
              diff:
                  ---
                  +++
                  @@ -17,5 +17,5 @@

                   # >>> [openmediavault]
                   /dev/disk/by-uuid/90f5ba3e-a359-4842-af40-b97774309bb3        /srv/dev-disk-by-uuid-90f5ba3e-a359-4842-af40-b97774309bb3    btrfs    defaults,nofail    0 2
                  -/srv/dev-disk-by-uuid-90f5ba3e-a359-4842-af40-b97774309bb3/hoplee-kaitak/        /sftp/hoplee-kaitak/hoplee-kaitak    none    bind,rw,nofail    0 0
                  +/srv/dev-disk-by-uuid-90f5ba3e-a359-4842-af40-b97774309bb3/hoplee-kaitak/        /sftp/kaitak-video-download-user/hoplee-kaitak    none    bind,ro,nofail    0 0
                   # <<< [openmediavault]
----------
          ID: fstab_systemctl_daemon_reload
    Function: module.run
      Result: True
     Comment: service.systemctl_reload: True
     Started: 11:48:47.327271
    Duration: 302.815 ms
     Changes:
              ----------
              service.systemctl_reload:
                  True

Summary for debian
------------
Succeeded: 5 (changed=4)
Failed:    1
------------
Total states run:     6
Total run time: 390.631 ms
[ERROR   ] Command 'umount' failed with return code: 32
[ERROR   ] stderr: umount: /srv/dev-disk-by-uuid-90f5ba3e-a359-4842-af40-b97774309bb3: target is busy.
[ERROR   ] retcode: 32
[ERROR   ] {'umount': "Forced unmount because devices don't match. Wanted: /dev/disk/by-uuid/90f5ba3e-a359-4842-af40-b97774309bb3 (/dev/sda), current: /dev/sdb, /dev/sdb, 90f5ba3e-a359-4842-af40-b97774309bb3"} in /usr/share/php/openmediavault/system/process.inc:247
Stack trace:
#0 /usr/share/php/openmediavault/engine/module/serviceabstract.inc(62): OMV\System\Process->execute()
#1 /usr/share/openmediavault/engined/rpc/config.inc(187): OMV\Engine\Module\ServiceAbstract->deploy()
#2 [internal function]: Engined\Rpc\Config->applyChanges()
#3 /usr/share/php/openmediavault/rpc/serviceabstract.inc(124): call_user_func_array()
#4 /usr/share/php/openmediavault/rpc/serviceabstract.inc(169): OMV\Rpc\ServiceAbstract->callMethod()
#5 /usr/share/php/openmediavault/rpc/serviceabstract.inc(646): OMV\Rpc\ServiceAbstract->{closure:OMV\Rpc\ServiceAbstract::callMethodBg():155}()
#6 /usr/share/php/openmediavault/rpc/serviceabstract.inc(155): OMV\Rpc\ServiceAbstract->execBgProc()
#7 /usr/share/openmediavault/engined/rpc/config.inc(209): OMV\Rpc\ServiceAbstract->callMethodBg()
#8 [internal function]: Engined\Rpc\Config->applyChangesBg()
#9 /usr/share/php/openmediavault/rpc/serviceabstract.inc(124): call_user_func_array()
#10 /usr/share/php/openmediavault/rpc/rpc.inc(86): OMV\Rpc\ServiceAbstract->callMethod()
#11 /usr/sbin/omv-engined(546): OMV\Rpc\Rpc::call()
#12 {main}

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ryecoaaron · Feb 11th 2026

You will need to reboot because the filesystem systemd is trying to remount has changed but it is in use.

openmediavault-sftp plugin: 500 Internal Server Error (Salt deploy fstab failed / device mismatch)

votdev Feb 10th 2026

Participate now!

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