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From: Zdenek Kabelac <zkabelac@redhat.com>
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Date: Wed, 22 Nov 2017 12:03:16 +0100
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Subject: Re: [linux-lvm] Reattach cache
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Dne 22.11.2017 v 11:15 Xen napsal(a):
> Zdenek Kabelac schreef op 22-11-2017 10:57:
> 
>> In your case - just destroy the cache (--uncache) and do not try to
>> reuse cache-pool unless you really know what you are doing.
> 
> But I still don't know how to clean the metadata manually.


Just drop/lvremove the cache-pool and create the new one again.
There is no specific 'zeroing' metadata command.

And as said - newer tool will ZERO by default and you need to pass -Zn to 
avoid zeroing (in case you want to reattach same cache-pool to unused data - 
but as said you need to be skilled user knowing what you are doing for this 
use case)

Zdenek