Recover and use an existing ZFS to PBS 4 after reinstall

[curiouscase]

I was running PBS 3.4.4 bare metal. I had a single SSD as my backup drive as a ZFS .
Today I tried to upgrade it to version 4 and the upgrade did not work. Consequently, I installed the version 4 afresh. Thereafter, I tried this guide here to remap my existing ZFS with backups. This got the Datastore showing and added but when I click on Datastore it keeps on saying Datastore is not available. Please let me know on what I need to do to get it recognized with my existing backups.

Edit: I checked and this is the error I am getting:

unable to open chunk store at "/mnt/datastore/Backup/.chunks" - No such file or directory (os error 2)

 

[Supaman]

S

[SOLVED] Post in thread 'Add existing Datastore to fresh installed PBS'

Jun 4, 2025

got it solved, one step was missing:

# 4
systemctl enable mnt-datastore-pve2_local_m2.mount
reboot

This creates a symlink in /etc/systemd/system/multi-user.target.wants

After that, reboot or restart the service.

• Supaman

Long story short: via GUi the Wizard does not allow to use a "just existing drive". you need to mount the datastore via shell, and if you want to have it permanent availible, you need to configure automaount on startup.

after mounting the datastore, you can go on via wizard, or edit the config file.