I, as many, have a BTRFS raid 5/6 story. I once worked at a place that had double digit TB databases. A few of the servers that predated me were set up with B

I, as many, have a BTRFS raid 5/6 story. I once worked at a place that had double digit TB databases. A few of the servers that predated me were set up with BTRFS raid 10 as their backup strategy. Basically stop the server, snapshot the volume, backup from the snapshot. It worked well enough. There came a point where we were going to have to move to a larger server as there were no more slots for additional disks. New hardware procured, provisioned, prepped, ready to roll with the exception of an actual cut over. However, c-suite got involved as they tend to do from time to time, and kept kicking the can down the road. Eventually disk space was a critical issue and a junior sysadmin decided it was a good idea to tell the COO that btrfs can be converted to raid 5 on the fly. I over the phone told them that this would guarantee data loss and refused. They literally came to my office to force my hand. Some people just have to learn the hard way. That story aside, I'm a big fan of BTRFS and have been using in various configurations on my desktops for years. I'm glad to see this progressing.