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Daniel Holm
Asked: 2017-06-08 11:00:14 +0800 CST

Undo reduction of LVM

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So I did something stupid while trying to solve my another issue by redoing (I thought) what I had done[1].

I ran the following command, think the number what the volume amount that I wanted to remove, not the size that was going to be set for the LVM: sudo lvreduce -L 1,8T /dev/server-vg/root

So now all the stuff on the other part of the LVM is gone - like many commands since the LVM was on top of a RAID0.

Is there any way of readding that part that I removed? Undoing what I just did?

I have backup, but I'd rather see if this is possible to do first.

I have tried to reset the size to the size that ought to be before I added the third disk (see [1]):

**sudo lvresize -L 3,7T /dev/server-vg/root**

And also tried to just use all that is available:

**sudo lvextend -l +100%FREE /dev/server-vg/root**

Both gives me: Command failed with status code 5.

1: Extend LUKS with physical drive. Unsure if new drive encrypts files

partitioning

2 Answers

  1. Look at the lvm config backups in /etc/lvm/archive and if you can find the one with the correct settings ( should be the most recent ), then resture it with vgcfgrestore

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  2. This is not a clear answer, but the issue is solved. What I did was to resotr a previous lvm config (though I had formated sdd since, I had do modify the backup file to change the ID to be the new ID of sdd. Then I ran kvpm. It said 6TB as it should. Then I renamed the group (I have done a new system install and the names were the same). At that point the size said 4TB. I than extended the logical volume, and resizing the file system as well. It gave a few errors but the filesystem is now mounted and my files are there.

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