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How do I properly resize my LVM partitions when it is inside LUKS? (mastodon.social)

submitted 8 months ago by [email protected] to c/[email protected]

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How do I properly resize my LVM partitions when it is inside LUKS?

Do I have to boot in a USB to do it or can it be done while the crypt is open/being used? I need to resize my root partition.

#linux #lvm #luks @linux

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[–] [email protected] 2 points 8 months ago (1 children)

What are you resizing though? The luks partition? a logical volume in lvm?

What command did you run that gave that error? What is it you're trying to do?

[–] [email protected] 1 points 8 months ago (1 children)

@[email protected] I didn't do anything fancy to be honest the resources pointed at me are not that different from what I did (example)

lvresize -r -L -80G /dev/mapper/laptop--lvm-home

But I think I got my cue from Arch Linux guide and will boot into a USB and do my resize commands.

Basically end result is just resize home to give root more space. All partitions in LUKS.

I think I got it from here knock on wood all that's left is just backup home, cross fingers and hope resizing goes through.

[–] [email protected] 2 points 8 months ago* (last edited 8 months ago) (1 children)

I wasn't expecting anything fancy - I just didn't know what you actually did. 🙂

You can generally resize on-line with LVM, but you're trying to shrink the partition by 80G which is more complicated that expanding. So yes you'll likely want to unmount the FS first as you'll need to shrink the filesystem first, then the logical volume.

I'm assuming your luks partition is just the whole disk as a physical volume in LVM? If so you just leave it alone. Unless you're trying to shrink the luks partition as well?

[–] [email protected] 1 points 8 months ago (1 children)

@[email protected] All's good. Yea, reason for the post was that even though I took the partitions offline it wouldn't still let me resize. So I think the best next move would be just booting into a USB and see if it lets me.

The whole disk well, only the boot is separated. The rest of the partition has the whole space controlled by LVM. Interestingly even though that may be the setup something was just rejecting my resize request.

Sadly have more to say but Mastodon limit is hitting haha. nutshell

[–] [email protected] 1 points 8 months ago

Did you already shrink the filesystem? I think lvresize will refuse to shrink if the FS is too big (not sure - I don't shrink volumes often).