[fnj]

HAMMER2 has been worked on for at least 6 years; AFAICT by one guy. Every year it is supposed to be happening Real Soon Now, but never appears to make any evident progress.

Matt Dillon does very impressive work, but the critical mass just isn't there.

[mjn]

It's possibly too big a task for one person, I agree. If he manages to get something usable in even 10-15 years, though, I'd be impressed. HAMMER2 is a clustering file system with POSIX semantics, and by the standards of that category, I don't think it's going all that slowly, to be honest. Ceph has had probably hundreds of person-years of development put into it, and only very recently have people started claiming CephFS is production-ready (and still many don't trust it).

[cyberpunk]

In $dayjob, I'd still go for gluster over ceph, with zfs on my storage nodes -- this obviously depends on what you're doing but in my case this would be shared storage for everything from images, logs and dataflow between some chunky legacy apps.

Why this stack? For no other reason really other than it works perfectly, has caused me almost no pain in the 6+ years I've used it for this kind of DFS stuff (across several clients) and there are no features I need in ceph which would make me take the less mature option.

I've been using LeoFS a little lately also again ontop of ZFS and it's working reasonably well (S3 compat stuff).

Currently why anyone would use HAMMER2 or BTRFS for anything important escapes me.

[JdeBP]

You might enjoy the discussions at https://news.ycombinator.com/item?id=13929692 .