Mistake: Mount ZFS to root folder

[ERM-Consulting]

Yes, very, very silly mistake:
Trying solving an issue on our BACKUP-ZFS-system I made a big mistake:
Umount ZFS dataset and later mount ZFS dataset but obvious to the wrong node. (I suspect I mounted it to "/" as everything stops immediately on mounting)

System could not answer any further request after the wrong mount: no Web-GUI anymore, no ssh login. Open putty session stops immediately too!
Booting the system stops when it access the zfs.

The system had been very stabil during the last 5 years, but now I cannot access the ZFS-datashare any more (NAS4FREE 10.2 - last uptime about 600 days).

The main issue as I understand is the mountpoint that is stored in the ZFS-dataset itself.
When I set up a new system (used XigmaNAS 12.1.9.4) I can access the server, the disks, can configure the virtual device BUT:
When importing the ZFS the system stops immediately

As the installation is on USB-Stick, I can start the configuration on a different PC and change any setting - BUT the mountpoint is in the ZFS-dataset and I cannot access the ZFS

Question:

• Is there any chance to manipulate the ZFS when I start XigmaNAS WITHOUT ZFS and I do NOT import the ZFS?

• Is there any option to change the mountpoint of the ZFS-dataset without "activating/mounting" the ZFS?

I tried to change the config.xml in the dataset section:
<canmount>NO</canmount>
But that does not stop the mounting

The mountpoint of the ZFS itself is ok: <mountpoint>/zDataBackup</mountpoint>
But the mountpoint of one of the datesets is wrong.

YES, I could destroy the ZFS as it is "only" our backup system but I wish to know if there is any option to solve the issue
(that is the way I learned most of my IT knowledge )

Many thanks for help in advance!
Heiko

[ms49434]

Yes, very, very silly mistake:
Trying solving an issue on our BACKUP-ZFS-system I made a big mistake:
Umount ZFS dataset and later mount ZFS dataset but obvious to the wrong node. (I suspect I mounted it to "/" as everything stops immediately on mounting)

System could not answer any further request after the wrong mount: no Web-GUI anymore, no ssh login. Open putty session stops immediately too!
Booting the system stops when it access the zfs.

The system had been very stabil during the last 5 years, but now I cannot access the ZFS-datashare any more (NAS4FREE 10.2 - last uptime about 600 days).

The main issue as I understand is the mountpoint that is stored in the ZFS-dataset itself.
When I set up a new system (used XigmaNAS 12.1.9.4) I can access the server, the disks, can configure the virtual device BUT:
When importing the ZFS the system stops immediately

As the installation is on USB-Stick, I can start the configuration on a different PC and change any setting - BUT the mountpoint is in the ZFS-dataset and I cannot access the ZFS

Question:

• Is there any chance to manipulate the ZFS when I start XigmaNAS WITHOUT ZFS and I do NOT import the ZFS?

• Is there any option to change the mountpoint of the ZFS-dataset without "activating/mounting" the ZFS?

I tried to change the config.xml in the dataset section:
<canmount>NO</canmount>
But that does not stop the mounting

The mountpoint of the ZFS itself is ok: <mountpoint>/zDataBackup</mountpoint>
But the mountpoint of one of the datesets is wrong.

YES, I could destroy the ZFS as it is "only" our backup system but I wish to know if there is any option to solve the issue
(that is the way I learned most of my IT knowledge )

Many thanks for help in advance!
Heiko

Code: Select all

zpool import

will list all pools that can be imported.

Code: Select all

zpool import -N -a

will import all available pools but will not mount any filesystems.
more to read: zpool

[ERM-Consulting]

My very best thank to you!
Worked immediately!

And in deed: checking with zfs list
it showed / as a mountpoint for one of the datasets.

zfs set mountpoint=/<mountpoint for pool>/<dataset> <pool>/<dataset>
zfs mount <pool>
zfs mount <pool>/<dataset>

And the server is up again - many thanks!