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Software RAID1: how to change disks? (lemmy.world)

submitted 6 months ago* (last edited 6 months ago) by peregus@lemmy.world to c/homelab@lemmy.ml

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I have installed Debian with software RAID1 (and installed Proxmox on it) on 2 256GB SSD and I now want to move to 2 500GB SSD, how do I proceed?

Edit: the RAID is of the OS disks.

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[–] chiisana@lemmy.chiisana.net 5 points 6 months ago* (last edited 6 months ago)

If you have enough drive bays, I'd probably shutdown the server, live boot into any linux distro without mounting the drives, then use dd to copy from 1st 256GB to 1st 500GB, from 2nd 256GB to 2nd 500GB, then boot the system, and use resize2fs to expand the file system to fill the partition.

Since RAID1 is just a mirror, the more adventurous type might say you can just hot swap one drive, let it rebuild, then hot swap the other, let it rebuild again, and then expand the file system all online live. Given it is only 256GB of data max, on a pair of SSD, it shouldn't take too long, but I'm more inclined to do it safely.