ZFS export Failed to execute command 'export

Donauschwabe · Jan 21st 2024

Hello,

I have a newly installed OMV.

I have set up ZFS here, but when exporting the zpool I get the following error message.

If I read it correctly, it can't run it, but I can't see why.

Who can help here ?

Quote

Failed to execute command 'export PATH=/bin:/sbin:/usr/bin:/usr/sbin:/usr/local/bin:/usr/local/sbin; export LANG=C.UTF-8; export LANGUAGE=; zpool export "Daten3TB"' with exit code '1':

OMV\ExecException: Failed to execute command 'export PATH=/bin:/sbin:/usr/bin:/usr/sbin:/usr/local/bin:/usr/local/sbin; export LANG=C.UTF-8; export LANGUAGE=; zpool export "Daten3TB"' with exit code '1': in /usr/share/php/openmediavault/system/process.inc:242

Stack trace:

#0 /usr/share/omvzfs/Utils.php(441): OMV\System\Process->execute(Array, 1)

#1 /usr/share/omvzfs/Zpool.php(345): OMVModuleZFSUtil::exec('zpool export "D...', Array, 1)

#2 /usr/share/openmediavault/engined/rpc/zfs.inc(226): OMVModuleZFSZpool->export()

#3 [internal function]: OMVRpcServiceZFS->exportPool(Array, Array)

#4 /usr/share/php/openmediavault/rpc/serviceabstract.inc(123): call_user_func_array(Array, Array)

#5 /usr/share/php/openmediavault/rpc/rpc.inc(86): OMV\Rpc\ServiceAbstract->callMethod('exportPool', Array, Array)

#6 /usr/sbin/omv-engined(537): OMV\Rpc\Rpc::call('Zfs', 'exportPool', Array, Array, 1)

#7 {main}

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Krisbee · Jan 21st 2024

What's the status of your pool? ( via WebUi pool > tools> details - or at the CLI zpool status ) Any outstanding OMV configurations not applied? That error message could simply mean the pool is currently being accessed, e.g: an open file share.

Donauschwabe · Jan 21st 2024

The status is OK via the web interface.

CLI:

Quote

:~# zpool status

pool: Daten3TB

state: ONLINE

scan: scrub repaired 0B in 00:00:02 with 0 errors on Sun Jan 21 18:07:45 2024

config:

NAME STATE READ WRITE CKSUM

Daten3TB ONLINE 0 0 0

mirror-0 ONLINE 0 0 0

ata-WDC_WD30PURX-64P6ZY0_WD-WMC4N0H93M7M ONLINE 0 0 0

ata-WDC_WD30PURX-64P6ZY0_WD-WMC4N0H3D2CH ONLINE 0 0 0

errors: No known data errors

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Addendum:

When I change any services (FileBrowser) and try to save them, I get more errors.

Somehow it can no longer save the settings.

Krisbee · Jan 21st 2024

Quote from Donauschwabe

Addendum:
When I change any services (FileBrowser) and try to save them, I get more errors.
Somehow it can no longer save the settings.

If you cannot save any configuration changes without generating errors, then you have a more general problem with OMV.

Donauschwabe · Jan 21st 2024

Something has gone very wrong.

I'm reinstalling the whole system.

It's not a production system yet.

Krisbee · Jan 21st 2024

AFAIK, an error in trying to export a busy zfs pool does not leave the OMV system in a failed state, there's is no config change to undo. After such an event, other further configuration changes should work normally

I'd start a new thread re: "not able to save (any?) configuration changes" and post that error message there.

Donauschwabe · Jan 21st 2024

I can't remember which setting that was, I've played around too much.

So I have now completely reinstalled the system.

But what I find strange is that after the reinstallation my dashboard settings look the same as before.

chente · Jan 21st 2024

Quote from Donauschwabe

But what I find strange is that after the reinstallation my dashboard settings look the same as before.

That's because your browser will still set cookies for the IP you're using, which I imagine is the same as before. This is how the board works.

Donauschwabe · Jan 21st 2024

Thanks for the tip.

I have now created a new ZFS pool as I can't import from the previous one.

Then I clicked on the ZFS pool, then on export in the menu and now the whole pool is no longer visible.

Where did it go?

chente · Jan 21st 2024

Quote from Donauschwabe

I have now created a new ZFS pool as I can't import from the previous one.
Then I clicked on the ZFS pool, then on export in the menu and now the whole pool is no longer visible.
Where did it go?

I have never done it in the GUI, but if you export a group it is because the next thing you are going to do is delete it from the system. So it is logical that the GUI removes this file system from the OMV database after exporting.

chente · Jan 21st 2024

You could still re-import the pool if the disks are still in the system. The pool has not been deleted, just exported.

Donauschwabe · Jan 21st 2024

Thanks for the info.

Are there any instructions on how to save individual OMV settings?

I have already seen the complete backup from your signature.

I would also like to be able to back up and restore only certain settings.

chente · Jan 21st 2024

Quote from Donauschwabe

Are there any instructions on how to save individual OMV settings?
I have already seen the complete backup from your signature.
I would also like to be able to back up and restore only certain settings.

No. There is nothing similar to omv-regen. omv-regen will restore everything you had on the original system. Although it allows you certain customizations, the network or the proxmox kernel.

You can "hack" the file that tells what plugins to install on the new system but nothing more. If you want to do that I can tell you how to do it.

Krisbee · Jan 21st 2024

Quote from Donauschwabe

Thanks for the tip.

I have now created a new ZFS pool as I can't import from the previous one.
Then I clicked on the ZFS pool, then on export in the menu and now the whole pool is no longer visible.
Where did it go?

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Where did it go? zpool export unmounts the pool from the system. For example:

Code

root@omvpve:~# zpool status
  pool: Opool
 state: ONLINE
  scan: scrub repaired 0B in 00:00:12 with 0 errors on Sun Jan 21 16:30:34 2024
config:

        NAME                           STATE     READ WRITE CKSUM
        Opool                          ONLINE       0     0     0
          raidz1-0                     ONLINE       0     0     0
            ata-QEMU_HARDDISK_QM00001  ONLINE       0     0     0
            ata-QEMU_HARDDISK_QM00003  ONLINE       0     0     0
            ata-QEMU_HARDDISK_QM00009  ONLINE       0     0     0

errors: No known data errors
root@omvpve:~# zfs list
NAME              USED  AVAIL     REFER  MOUNTPOINT
Opool            4.16G  34.2G     34.6K  /Opool
Opool/adata      1.33G  34.2G     1.33G  /Opool/adata
Opool/bdata       213M  34.2G      213M  /Opool/bdata
Opool/mdata       114M  34.2G      114M  /Opool/mdata
Opool/odata      2.51G  34.2G      114M  /Opool/odata
Opool/tdata      4.64M  34.2G     4.64M  /Opool/tdata
Opool/test-data  32.0K  34.2G     32.0K  /Opool/test-data
Opool/zdata      51.3K  34.2G     34.0K  /Opool/zdata
root@omvpve:~# mount | grep zfs
Opool on /Opool type zfs (rw,noatime,xattr,posixacl)
Opool/adata on /Opool/adata type zfs (rw,noatime,xattr,posixacl)
Opool/mdata on /Opool/mdata type zfs (rw,noatime,xattr,posixacl)
Opool/bdata on /Opool/bdata type zfs (rw,noatime,xattr,posixacl)
Opool/test-data on /Opool/test-data type zfs (rw,noatime,xattr,noacl)
Opool/zdata on /Opool/zdata type zfs (rw,noatime,xattr,noacl)
Opool/tdata on /Opool/tdata type zfs (rw,noatime,xattr,posixacl)
Opool/odata on /Opool/odata type zfs (rw,noatime,xattr,posixacl)

Now export pool via the Webu and the pool is umounted

Check export on system:
root@omvpve:~# journalctl -f
Jan 21 22:04:02 omvpve systemd[1]: Opool-zdata.mount: Deactivated successfully.
Jan 21 22:04:02 omvpve systemd[1]: Opool-test\x2ddata.mount: Deactivated successfully.
Jan 21 22:04:02 omvpve systemd[1]: Opool-tdata.mount: Deactivated successfully.
Jan 21 22:04:02 omvpve systemd[1]: Opool-odata.mount: Deactivated successfully.
Jan 21 22:04:02 omvpve systemd[1]: Opool-bdata.mount: Deactivated successfully.
Jan 21 22:04:02 omvpve systemd[1]: Opool-mdata.mount: Deactivated successfully.
Jan 21 22:04:02 omvpve zed[4648]: eid=62 class=pool_export pool='Opool' pool_state=EXPORTED
Jan 21 22:04:02 omvpve zed[4650]: eid=63 class=config_sync pool='Opool' pool_state=UNINITIALIZED
Jan 21 22:04:03 omvpve systemd[1]: Opool-adata.mount: Deactivated successfully.
Jan 21 22:04:03 omvpve systemd[1]: Opool.mount: Deactivated successfully.

Check mounts on system:

root@omvpve:~# mount | grep zfs
root@omvpve:~#

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After an export the pool is still present system on the system but unmounted. This would, for example, allow you to move the disks to another machine and import the pool there.

Donauschwabe · Jan 21st 2024

Quote from Krisbee

Where did it go? zpool export unmounts the pool from the system.

This is then wrong in the naming.

It should then be labeled as follows: "zpool unmount"

If I have understood this correctly, then I can completely reinstall the system and then simply go to "zpool import" and my pool is there again. ?

Krisbee · Jan 21st 2024

Quote from Donauschwabe

This is then wrong in the naming.
It should then be labeled as follows: "zpool unmount"

If I have understood this correctly, then I can completely reinstall the system and then simply go to "zpool import" and my pool is there again. ?

Yes, if you installed the correct plugins on OMV first. The name follows the openzfs standard. See: https://openzfs.github.io/open…ter/8/zpool-export.8.html

Donauschwabe · Jan 21st 2024

Quote from Krisbee

Yes, if you installed the correct plugins on OMV first. The name follows the openzfs standard.

ok, I understand.

Let's assume my device breaks down and I don't have OMV available.

But then I should be able to restore the zpool e.g. in Linux Mint or Debian.

If I have Openzfs installed on the system ?

Krisbee · Jan 22nd 2024

Moving a zfs pool from OMV6 to latest Linux Mint or Debian 12 should be OK. Problems can occur if you move a zfs pool from system A to System B where the two systems are using different zfs versions and pool features.

chente · Jan 22nd 2024

Donauschwabe

Maybe you would benefit from reading a little about ZFS management. Aaron Toponce's documentation is very instructive, it helped me a lot to understand ZFS. Although it is an old document, everything it says is still valid, in fact it is still a reference in the OpenZFS documentation, although the link is broken. This link still allows access to the document. https://web.archive.org/web/20…l-zfs-on-debian-gnulinux/

Donauschwabe · Jan 22nd 2024

Quote from Krisbee

Moving a zfs pool from OMV6 to latest Linux Mint or Debian 12 should be OK. Problems can occur if you move a zfs pool from system A to System B where the two systems are using different zfs versions and pool features.

Thanks for the info, I guess zfs is not an option for me then.

One last question:

What about BTRFS ?

Is it as problematic with btrfs as with zfs ?

Or can I mount BTRFS just like ext4 in any Linux distro without any problems ?

Quote from chente

Maybe you would benefit from reading a little about ZFS management. Aaron Toponce's documentation is very instructive, it helped me a lot to understand ZFS. Although it is an old document, everything it says is still valid, in fact it is still a reference in the OpenZFS documentation, although the link is broken. This link still allows access to the document.

Thanks for the tip, I'll read through it when I get the chance.

ZFS export Failed to execute command 'export

macom Jan 21st 2024

Donauschwabe Jan 21st 2024

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