Help with zfs raid issue

I am a very new user of proxmox, and recently I have purchased an r730 to play with homelab stuff. I have a previous "test" install of proxmox which I installed on a zfs raid 0 partition of 2 1,8gb drives. I did not really understand what I was doing at that point. After that, I got some new, smaller drives, so I moved the 2x1.8tb drives to slots 5 & 6, and insalled the new ones in 1-4. I did a fresh install of proxmox on one of the new 300 gb drives.

Now the issue is that the 2...

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