Thanks for your perspective.

I decided to go with the new vdev because:

• That way, I have access to all 5TB (1TB from the old SSD and 4TB from the new one).
• One pool is easier to manage than two.
• I know that I don’t have auto-healing, and if either of the SSDs fails, I lose the whole pool, and I accept that.

I did this via:
zpool add ssdPool /dev/disk/by-id/nvme-Samsung_SSD_990_PRO_4TB-part3

I don’t like ext4 because it is not easily backupable (it doesn’t have snapshots, which are moved periodically to hddPool).

worked as a charm exactly what I wanted

What is the name of this app?

Yes

i regenerated cache by clicking Settings > Omnisearch > Clear cache

https://duckduckgo.com/?q=deadpool&iar=images&iax=images&ia=images Super hero from marvel

Looks like deadpool little bit to me

https://img-9gag-fun.9cache.com/photo/a8qZ1B6_460svav1.mp4

lemmy isn’t really oriented in that way.

seems you know something can you elaborate more

thx for sugestion

looks very promising src

# zfs create pool/project/production
  populate /pool/project/production with data
# zfs snapshot pool/project/production@today
# zfs clone pool/project/production@today pool/project/beta
  make changes to /pool/project/beta and test them
# zfs promote pool/project/beta
# zfs rename pool/project/production pool/project/legacy
# zfs rename pool/project/beta pool/project/production
  once the legacy version is no longer needed, it can be destroyed
# zfs destroy pool/project/legacy

not tested yet

Do you have a stl of little white cat?