thin_dump takes a long time on large thinpool

[fiskn]

Hi,

Just trying to use lvmsync to sync a LV, whilst everything works, the thin_dump part at the start of the process takes a very long time. I assume this is down to the large size of our thinpool metadata (100TB data, 8GB Meta)

I was wondering if lvmsync could use the thin_delta tool instead?

https://www.mankier.com/8/thin_delta

This post seems to describe a similar use case.

jthornber/thin-provisioning-tools#23

Any thoughts?