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Daniel Holm
Asked: 2015-10-26 07:24:22 +0800 CST

Let LVM+LUKS volume grow over new drive or RAID?

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I would like to extend the storage capacity on my Ubuntu server by adding more drives.

I'm currently using LVM+LUKS on my server and I'm having some difficulty understanding how I may add new drives to the existing LVM volume without having to re-install the whole system. From what I understand that's the reason of using LVM - extending the storage capacity on the fly -pretty much.

But how do I do this if the volume also in encrypted? Is it even possible since, from what I understand, the LUKS actually pretty static from the initial capacity?

I have two drives set up as a software RAID 0 that I'd like to use in the current running system volume, using only one additions disk.

Cheers, Daniel

encryption

1 Answers

  1. You can use cryptsetup to initialize a partition on the new disk as another LUKS volume ( you will now have to supply both passphrases at boot time to unlock ), and then use pvcreate to initialize the new LUKS device as an LVM physical volume. Then vgextend to add that volume to the volume group, and finally you can use lvconvert to convert your existing logical volumes to raid0, which will stripe them between the two drives. You probably will also want to use lvextend to increase the size of the logical volume, and resize2fs to expand the filesystem on it to use the additional space.

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