Using a truncated file for not just practice, but production?

[feinedsquirrel]

I see. I just looked up the difference between fallocate and truncate.

It made me have another question, but I think it belongs as a new topic here:

Benefits or drawbacks to `truncate` vs `fallocate` for file-based pool

Follow up from my question here: Evidence says it is possible, and stable, to use a file for a production pool under restricted available options. That question was fully answered and solved, so I’m opening this new, related question. If I am going to use a file for a prod pool, it seems I have two options: truncate - creates a sparse file (at least on ext4?) and any data written to it will result in fragments being written to disk fallocate - sparse file, actual addresses reserved, so no f…