On 2020-05-05 10:10, linux guy wrote:
> # lvreduce -L 6G /dev/mapper/fedora_localhost--live-home
>   WARNING: Reducing active and open logical volume to 6.00 GiB.
>   THIS MAY DESTROY YOUR DATA (filesystem etc.)
> Do you really want to reduce fedora_localhost-live/home? [y/n]:
> Is lvreduce smart, ie does it know not to touch existing data ?
>

FWIW, I generally use lvresize and only on unmounted file-systems.
I'm pretty much sure that is what the warning is trying to tell you.
Having an active filesystem during a resize operation sounds dangerous to me.

(I've not used LV's much recently)


-- 
The key to getting good answers is to ask good questions.
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