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So, I'm trying to clone an SSD to an NVME drive and I'm bumping into this "dev-disk-by" error when I boot from the NVME (the SSD is unplugged).
I can't find anyone talking about this in this context. It seems like what I've done here should be fine and should work, but there's clearly something I and the arch wiki are missing.
Definitely second this. If you're using LVM, it uses the physical UUID for the pv. You have to update that on the new drive so it knows where the vg and lvs are being mounted to.
There wasn't any LVM involved, it's AFAIK pretty rare outside of MBR installs (as GPT typically lets you have more than enough partitions).
LVM is actually super common. Most Linux distros default to LVM unless you do custom partitioning. It's not just about the max number of partitions supported by the table. LVM provides a TON more flexibility and ease of management of partitions.
I haven't seen LVM in any recent Fedora (very high confidence), Debian (high confidence), or OpenSUSE (fairly confident) installations (just using the default options) on any system that's using GPT partition tables.
For RAID, I've only ever seen mdadm or ZFS (though I see LVM is an option for doing this as well per the arch wiki). Snapshotting I normally see done either at the file system level with something like rsnapshot, kopia, restic, etc or using a file system that supports snapshots like btrfs or ZFS.
If you're still using MBR and/or completely disabling EFI via the "legacy boot loader" option or similar, then yeah they will use LVM ... but I wouldn't say that's the norm.
That's fair, I should have clarified that on most Enterprise Linux distros LVM is definitely the norm. I know Fedora switched to btrfs a few releases back and you may be right about Suse Tumbleweed but pretty sure Suse Leap uses LVM. CentOS, RHEL, Alma, etc. all still default to LVM, as the idea of keeping everything on a single partition is a bad idea and managing multiple partitions is significantly easier with LVM. More than likely that'll change when btrfs has a little more mileage on it and is trusted as "enterprise ready" but for now LVM is the way they go. MBR vs GPT and EFI vs non-EFI don't have a lot to do with it though, it's more about the ease of managing multiple partitions (or subvolumes if you're used to btrfs), as having a single partition for root, var, and home is bad idea jeans.
That's fair, I did just check my Rocky Linux install and it does indeed use LVM.
So much stuff in this space has moved to hosted/cloud I didn't think about that.