Quoting [email protected] ([email protected]):

> Last time I checked XFS had no support for reducing the size of a
> filesystem.  

Correct.

> But if Stratis is going to use multiple XFS filesystems to compare
> with the multiple ZFS mount points or BTRFS subvols then it will be a
> massive problem.

The design paper claims online grow abilities adequately meets their
needs.  I've only just now skim-read that paper, so I cannot comment.

> Stratis is aiming for a version 1.0 release next year, and version 3.0 is 
> aimed at having ZFS feature parity.  That's not good for all the people who 
> need ZFS features today!

Welcome to the real world of software development, eh?

RH aren't going to ship ZFS unless Oracle Corp. issue a licence
exception (alongside the CDDL terms), and that's not going to happen.

(Well, RH could ship FUSE_ZFS, but they aren't going to do that
either, for reasons of performance.)

> XFS has no support for checksums that compares to ZFS and BTRFS.  To do it 
> properly you need to do it in the filesystem.  

Whitepaper section 10.2.2 et seq. talks about their plans in this area.

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