I use libgfap in production, the performance is worth a couple of quirks for me.
- watch major version updates, they’ll silently turn it off because the engine starts using a new version variable
- VM/qemu security quirk that resets ownership when the VM quits, was supposedly fixed in 4.3.6 but I still have it happen to me, a cron’d chown keeps it under control for me
- some VMs cause a libvirt/vdsmd interaction that results in failed stats query, and the engine thinks my VMs are offline because the stats gathering is stuck. hoped a bug fix in 4.3.6 would take care of this too, but didn’t. may be my VMs though, still analyzing for specific file issues
I need to spend some time doing a little more research and filing/updating some bug reports, but it’s been a busy end of year so far…