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From: Zdenek Kabelac <zkabelac@redhat.com>
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Date: Tue, 15 Jan 2019 11:49:34 +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>, Zdenek Kabelac <zkabelac@redhat.com>

Dne 14. 01. 19 v 23:44 Davis, Matthew napsal(a):
> Hi Zdenek,
> 
> `sudo lvs --version` says :
> 
>    LVM version:     2.02.180(2)-RHEL7 (2018-07-20)
>    Library version: 1.02.149-RHEL7 (2018-07-20)
>    Driver version:  4.37.1
> 
> So that means it's version 2, right?
> 
> (I'm running the latest version of CentOS.)

Hmm - version looks fine

>>       $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
> 


Can you paste 'lvs -a' prior this operation ?

If the lvm2 tells you that 'mySnap1' is not mergable LV - then
it likely has no 'origin' to merge into.


Zdenek