proxmox 8 cannot import rpool no such pool or dataset

Adding PCI(e) devices can change the PCI ID of other PCI(e) devices. Is your rpool on a NVMe (which is a PCIe device)?
I would expect problems what adding a device but maybe you simply disconnected the drive? Or maybe the use of a PCIe slot cause the M.2 slot to be disabled, which happens on some motehrboards? Does you BIOS see the drive with the rpool? Do you have a link to your motherboard manual?
Shut it down, take the NIC out and try it again.

You must have a zfs root partition, eh? It's probably, as leesteken suggests, a change in some identifier due to everything being dynamically configured. "We can't possibly keep device IDs from changing every time a computer starts or restarts!" Anyways

Hopefully, it will boot. Ideally you'd export and reimport the zpool using a different device identifier that would not change. However, since it's your root partition I have no idea how you'd do that.

If you do a zpool list -v the name part should be how the device was specified when imported. There's a few options in /dev/disk/by-id/ and hopefully at least one of them isn't subject to changing when a device is added to the system.


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