[mindajar]

Classic comic, but I don't think it applies. APFS looks intended to solve Apple's product problems really well, and it doesn't even try to be a filesystem for everyone.

Apple has said from time to time that they're all about owning and controlling the key technologies that go into their products. APFS makes a lot of sense from that perspective, and this seems one of those cases where going their own way is better than importing someone else's constraints. ZFS on an Apple Watch? LOL.

[tfar]

I would not be surprised if one could write a ZFS implementation optimized for more constrained devices. If you already know you are going to a have flash storage you can probably ditch some of the N layers of cache you see in common ZFS implementations. Not that ZFS is a one size fits all, but the file systems specification could be implemented in more than one way.

[mindajar]

If you assume Apple cares about having a disk format in common with other platforms, sure, I'd agree that's probably possible. But I don't think they do; they seem to care a lot more about things like a unified codebase across their platforms, the energy-efficiency initiatives they've been pushing for a few years, owning the key tech in the products, etc.

One slide in the WWDC talk deck showed a bunch of divergent Apple storage technologies across all their platforms that are being replaced by APFS. If ZFS has to fork into weird variants to run well on the phone or watch, that seems less appealing than a single codebase optimized for just the stuff Apple products do.

[idorosen]

Should have said s/standards/filesystems/g... :-)

I was reacting to the idea of APFS for macOS, as well as having yet another filesystem to deal with on external media that interacts with multiple computers (HDDs/SSDs/USB flash drives/etc.).

[mindajar]

Is moving data between computers that way a thing that non-technical people do often? FAT-formatted USB sticks seem to be good enough for that, but e-mail/Dropbox/file sharing/cloud sharing/AirDrop have much better UX for the average person.

[idorosen]

Yes, it is a thing people do. The problem is, those non-technical people do not understand on-disk formats. (Nowadays, most USB sticks come preformatted as ExFAT.) There are also offline and low bandwidth situations. In healthcare it's common too thanks to HIPAA and nervous hospitals: let's say a patient wants to transfer a set of MRI or CT scan images/videos (typically provided on CD or DVD, in which case it's ISO9660, but sometimes USB stick - hopefully ExFAT but sometimes worse).