In 1994, we used to joke that XFS was a write-only filesystem. The early version was less than stellar. SGI pretty quickly solved the worst issues. It sure was nice not having to wait for 6 hours for a Challenge XL to fsck.
Wow, that is uncanny, in 2012, at a former employer, that was our joke for btrfs right before we switched to xfs with Ceph for our OpenStack product. We still had problems that appeared to be locks between xfs above and below Ceph, but nothing catastrophic like the customer problems with btfs where we knew the data had been written, but recover was not reasonable.
