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From: Zdenek Kabelac <zdenek.kabelac@gmail.com>
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Date: Tue, 9 Apr 2019 15:24:05 +0200
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Subject: Re: [linux-lvm] can't remove snapshot
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To: LVM general discussion and development <linux-lvm@redhat.com>, "Lentes, Bernd" <bernd.lentes@helmholtz-muenchen.de>

Dne 09. 04. 19 v 15:00 Lentes, Bernd napsal(a):
> Hello list,
> 
> I have a two-node HA-cluster which uses local and cluster LVM.
> cLVM is currently stopped, I try to remove a snapshot from the root lv which
> is located on a local VG.
> I get this error:
> ha-idg-2:/mnt/spp # lvremove -fv vg_local/lv_snap_pre_sp4
>    connect() failed on local socket: No such file or directory
>    Internal cluster locking initialisation failed.
>    WARNING: Falling back to local file-based locking.
>    Volume Groups with the clustered attribute will be inaccessible.
>      Archiving volume group "vg_local" metadata (seqno 26).
>      Removing snapshot volume vg_local/lv_snap_pre_sp4.
>      Loading table for vg_local-lv_root (254:8).
>    device-mapper: reload ioctl on  (254:8) failed: Invalid argument
>    Failed to refresh lv_root without snapshot.
> 

Hi

Have you tried to converted clustered VG to be a non-clustered one ?
And use file locking to proceed with operation on local device?

Zdenek