Advice on `options overlay metacopy=off redirect_dir=off`

[polarathene]

There is advice from articles such as this one to disable OverlayFS module options: metacopy + redirect_dir.

On one of my systems both are enabled by default (personal system), while another they're both disabled (VPS). docker info likewise confirms the "Native Overlay Diff" as false for the personal system, and true for the VPS.

Your wiki article on container recommendations encourages these options to be enabled, but at the end mentions to downgrade / disable them for building images?

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Can you clarify if the blog article is encouraging to improve the build with "Native Overlay Diff", at the expense of benefits elsewhere from no longer having those features enabled?

It doesn't seem practical to get the best of both if that involves unloading the kernel module each time to change the options?

Besides containers, I assume there is possibly other reasons why you might not want to disable the options?

[amir73il]

I don't know where to start, but downgrade does not mean uploading kernel module at all. I means something completely different.

Maybe the motivation and implications are more understood in my talk from LPC:
https://www.youtube.com/live/fSyr_IXM21Y?feature=share (@56:00)