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How to image a Debian system on a zfs mirror?
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this post was submitted on 22 May 2024
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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.
The SSD is 256GB while the two HDDs are 4TB each. What kind of zfs config/array do you suggest I create from them?
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.
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)