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From: Zdenek Kabelac <zkabelac@redhat.com>
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Date: Thu, 10 Jan 2019 10:45:24 +0100
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Subject: Re: [linux-lvm] how to copy a snapshot,
	or restore snapshot without deleting it
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To: LVM general discussion and development <linux-lvm@redhat.com>, "Davis, Matthew" <Matthew.Davis.2@team.telstra.com>

Dne 10. 01. 19 v 7:23 Davis, Matthew napsal(a):
> Hi Marian,
> 
> I'm trying to do it with thin snapshots now. It's all very confusing, and I can't get it to work.
> I've read a lot of the documentation about thin stuff, and it isn't clear what's happening.
> 
> I took a snapshot with
> 
>      sudo lvcreate -s --name mySnap1 centos/root
> 
> Then I copied that snapshot with
> 
>      sudo lvcreate -s --name mySnap2 centos/mySnap1
> 
> When I try to restore mySnap1 it says:
> 
>      $sudo lvconvert --merge centos/mySnap1
>      centos/mySnap1 is not a mergeable logical volume
> 

Hi

Aren't you using some quite ancient version of lvm2 ?
You need to use lvm2 which does support thin volume merging

Regards

Zdenek