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

[Gionatan Danti]

Il 2021-08-09 05:53 Ming-Hung Tsai ha scritto:
> It sounds like you intend to keep snapshots that have been updated
> (written) since its creation, right?

True.

> 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.

Interesting approach, thanks.

> Checking device activation might not meet what you need. An activated
> device might or might not receive any write, so you don't know whether
> a device has been updated by looking into its activation history.

Sure, but it can be a reasonable approximation before further 
inspection. Also, I wonder if dumping data mappings can be slow for big 
volumes.

Thanks.

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Danti Gionatan
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