this post was submitted on 13 Mar 2024
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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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[–] atzanteol@sh.itjust.works 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 than 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?

[–] talesofaprinny@mastodon.social 0 points 8 months ago (1 children)

@atzanteol 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

[–] atzanteol@sh.itjust.works 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).