[linux-lvm] How to check if thin volume or snapshot was ever activated

[Ming-Hung Tsai]

On Mon, Aug 9, 2021 at 11:53 AM Ming-Hung Tsai <mingnus at gmail.com> wrote:
>
> On Sat, Aug 7, 2021 at 7:43 PM Gionatan Danti <g.danti at assyoma.it> wrote:
> >
> > I wonder: can we detect if a volume/snapshot was *ever* activated? My
> > reasoning is that a never-activated snapshot surely did not receive any
> > application writes, so it can be safely removed (ignoring snapshot
> > retention policy).
>
> It sounds like you intend to keep snapshots that have been updated
> (written) since its creation, right?
> The precise way might be checking the data mappings via thin_dump. An
> updated device has data mappings with timestamps greater than the

                ^^^^^^^^^^^^
> device's creation time.

sorry, I mean "greater than or equal to"