[linux-lvm] Time needed for take a snapshot

Gionatan Danti g.danti at assyoma.it
Mon Jan 20 15:54:27 UTC 2020

Il 20-01-2020 15:40 Zdenek Kabelac ha scritto:
> Yep - kernel metadata 'per thin LV' are reasonably small - so even for
> big thin devices it still should fit within your time boundaries.
> (effectively thin snapshot just increases 'mapping' sharing between
> origin and its snapshot - so the time needed depends on how many bTree
> nodes needs to be updated - so if you would manage to create heavily
> fragmented multi TiB thinLV, the time depends on speed of you metadata
> device - as long as device is fast (i.e. >= SSD) - operation should be
> quick.
> But ATM there is no scientific proof for the worst case scenario.

Well, I'll do some tests and update here if finding anything 

Danti Gionatan
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