On Fri, May 27, 2016 at 8:51 PM, Max Yehorov <myehorov@xxxxxxxxxx> wrote:
> Hi,
> If anyone has some insight or comments on the question:
>
> Q) Flatten with IO activity
> For example I have a clone chain:
>
> IMAGE(PARENT)
> image1(-)
> image2(image1@snap0)
>
> image2 is mapped, mounted and has some IO activity.
>
> How safe to flatten image2 if it has ongoing IO
It's no less safe than concurrent writes to the clone. "copyup"
(guarded write) operation is atomic: data from the parent is pulled up
into the clone only if the clone object doesn't already exist.
flatten is essentially just a copyup of every object in the clone
image.
Thanks,
Ilya
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