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How to image a Debian system on a zfs mirror? (discuss.tchncs.de)

submitted 6 months ago* (last edited 6 months ago) by [email protected] to c/[email protected]

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I have set up a refurbished PC as a media PC with storage. The OS, Debian, is on an m.2 nvme disk of 256 GB. I have connected 2x4TB risks in zfs mirror mode to store my media.

Off late, while booting, I've noticed some messages that suggest that the health of nvme disk is not good. Searching the error, i realised that I should not rely on it. I've done a number of tweaks to set up my system the way I like that I want to save by creating an image of the OS drive on a fresh nvme disk of same size that I have.

How do I go about doing it? I could boot using a live USB and create the image on the HDDs but the live USB OS won't recognise my zfs, right? Is using another external disk or another PC my only option here?

Thanks and cheers!

PS: The machine is a HP Elitedesk 800 G3 that has a wifi port that I've heard can be used as additional port for m.2 drives. Is it true?

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[–] [email protected] 1 points 5 months ago (1 children)

You need to add the new drive to your existing pool because ZFS stores data across all drives by default, similar to a RAID0. Then you remove the old drive and ZFS will automatically copy the data off the failing drive onto the healthy one and allow you to remove the failing drive with no data loss.

[–] [email protected] 2 points 5 months ago (2 children)

The SSD is 256GB while the two HDDs are 4TB each. What kind of zfs config/array do you suggest I create from them?

[–] [email protected] 2 points 5 months ago* (last edited 5 months ago)

That depends on your use case, I just did a simple zpool with no redundancy because I wanted maximum speed/capacity and all my data is backed up on an external HDD. If you need redundancy, I would look online for how to configure that and what the optimal setup is.

[–] [email protected] 1 points 5 months ago* (last edited 5 months ago)

Actually, I assumed you just had the SSD, if you have more than 256gb of free space between those HDDs, you can go ahead and remove the SSD from your zpool right now (unless your bootloader is there, then you'll have to make an EFI system partition on one of the HDDs and install a bootloader first)