My story is a bit dated, but we went from gluster to ceph to moosefs at one startup. Gluster had odd performance problems (slow metadata operations - scatter/gather rpcs and whatnot I would guess) and it was hard to know from the logs what was going on. Ceph was very very early at this point, but part of it ran as a kernel module and the first time it oops'd, I deleted that with fire. MooseFS ran all in userspace, had good tools for observability into the state of the cluster, and the source code was simple and clean. It didn't have a good story around multi-master at that time, but I think that is improved now.

It's an amazing piece of software, but takes a great deal of engineering to get right. Most folks won't invest that much engineering into their storage.

This is why Providers like EMC and NetApp can extract 10x the cost of the raw storage from enterprises.

The RedHat commercial support has been pretty good for us. We presented them with 2 bugs, and they addressed both. One took a few weeks but one only took a few hours to get a hotfix started.

EMC storage is absolute trash post Dell merger. Pure 100% dumpsterfire. Their customers know their systems better than they do. It's pathetic.

"We have about 200 harddisk in this cluster... 1 of the disks was broken and we removed it. For some reasons, Ceph stopped to working : 17 objectfs are missed. It should not."

I think the underlying issue is simply "Ceph" ;-)