[linux-lvm] unable to remove snapshot of raid1 leg

Zdenek Kabelac zdenek.kabelac at gmail.com
Tue Oct 24 11:03:15 UTC 2017

Dne 23.10.2017 v 18:40 Alexander 'Leo' Bergolth napsal(a):
> On 10/23/2017 04:44 PM, Heinz Mauelshagen wrote:
>> LVM snapshots are meant to be used on the user visible raid1 LVs.
>> You found a bug allowing it to be used on its hidden legs.
>> Removing such per leg snapshot should be possible after the raid1 LV got
>> deactivated.
> Hmm. This LV is currently in use. Any chance to remove it with the raid1
> LV active?
> Cheers,


Not with lvm2 command.

I could probably imagine a way with several dmsetup commands but it looks
fairly easier to do it in some 'offline' time.


The one 'risky' idea could be to try 'vgcfgrestore' metadata before taking
snapshot then (forcibly) remove  (dmsetup remove (-f)  vg-snapshot)  so 
snapshot is no longer referencing origin.
(force should not be needed - but if some has opened snapshot...)

Then you should be able to use  'lvchange --refresh vg'

and finally drop  'left-over'  cow volume with dmsetup remove.
(and make sure snapshot is already gone - if not - try remove again)



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