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Proxmox 8 boot disk migration, HDD to SSD using dd (lemmy.dbzer0.com)

submitted 5 months ago* (last edited 5 months ago) by drkt@lemmy.dbzer0.com to c/selfhosted@lemmy.world

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v !!! POST-MIGRATION EDIT !!! v

I shrunk the LVM partition by 5000 MiB and just ran dd overnight. I had to shuffle my boot-order around a bunch to find the one partition that would boot properly but it all just works.

v !!! ORIGINAL POST !!! v

Hi! My Proxmox machine has 3 disks (see pic). I wish to migrate sdc to a 2TB SSD. I have LXCs on all drives and I would really like to avoid having to restart from backups. I don't have any special configuration on my proxmox, it's pretty clean and basic.

Is it safe to simply dd the old disk to the new one? I can't find an explicit answer to this question that doesn't also have a lot of other variables not relevant to me.

If not, what else can I do?

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[–] just_another_person@lemmy.world 8 points 5 months ago (1 children)

There's nothing wrong with using DD for this, but unless you're sure of the geometry of the new SSD, you may run into issues. The size of your new SSD needs to be exactly the same size or larger to fit the existing partitions of sdc since you'd be doing a block copy. Get a slightly larger drive to be safe and you'll be fine.

Honestly, DD is hard mode for this. Use a cloner that checks these things or shrinks partitions beforehand to prevent issues if you decide to go with a 2TB SSD.