I've been watching this project for a number of years and its always interesting to see where a fork goes, Hammer and a number of other interesting choices have made this version of BSD stand out. But does anyone use it in production ? If you do, what was the primary reason ?
Use it as a gateway, a web server (shiningsilence.com), and a music machine at home. At work as a host for a few software packages (Mediawiki, though not since a switch to Confluence, Request Tracker, and a few smaller web services) I'm using it both on hardware and as VMs.
I have never had resource problems other than filling up Hammer volumes because I didn't set the right clean rate relative to disk activity. e.g. I can give it a piddly amount of RAM and CPU and never notice.
I've never used it in production, but I switched to it in the FreeBSD 6 era until FreeBSD 8 came out. I switched to it because FreeBSD 5 was a dog and couldn't stand it. I used it more recently on my x220 because they supported my Intel graphics card where as FreeBSD didn't yet.
Even more recently I tried it for a client for their little-of-everything server. I didn't use it because they wanted some ZFS features (send/recv). Dragonfly got much better performance for things like NFS and their rather large MySQL databases, though.
I have never had resource problems other than filling up Hammer volumes because I didn't set the right clean rate relative to disk activity. e.g. I can give it a piddly amount of RAM and CPU and never notice.
I'm the person behind the DragonFly Digest (https://www.dragonflydigest.com/) so it's not a surprise that I would use it.