Creating Raid array w/o data loss

Ask Fedora
1

I recently pulled out a Raspberry Pi 4 from the depths of the underworld (the basement), and now I’m planning to setup a NAS with it. Right now, i just have a single 4tb hdd with a couple of things on it, but I also have another one on the way for RAID1. The Pi’s running Fedora iot.

How can I create a Raid1 array from the preexisting hdd w/o losing data?

Cheers.

4

Are you saying that there is room on the disk to add the raid headers without changing the position of the existing partitions?

6

I’m not sure that inplace upgrade from non-RAID to RAID will work.

The safe way is to backup all data and then format specifically for raid.
Then restore the backed up data into the RAID file system.