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I am currently using Container Linux for my home server and I want to upgrade to Flatcar Linux. To do this I plan to use Ignition and configure RAID 1 for the root filesystem.

I have two disks dedicated for the root filesystem and the rest form a BTRFS array for extra storage, so I want to make sure not to overwrite the BTRFS disks. The root disks for Container Linux currently register as /dev/sda and /dev/sdb. My understanding is that the names of these disks depends on which Linux kernel you are using and other random boot factors.

How can I make sure I pick the right disks in my Ignition configuration? I guess this is a very common issue but I can't find anything specific to Container Linux/Flatcar Linux.

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I solved this using the WWNs in /dev/disk/by-id.

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