He may be talking about the need to rebalance ... I run a btrfs balance every month to make sure I don't run out of space again. It happened to me while on vac

He may be talking about the need to rebalance ... I run a btrfs balance every month to make sure I don't run out of space again. It happened to me while on vacation -- I only had satellite internet and had to fix it over ssh at single characters per second. It might have to do with a bug I saw mentioned on the list that referred to the free space map getting corrupted (but easily fixed with a -oremount,clear_cache). So I also run that monthly as well. I've been too afraid to remove the cron job even though I moved my CentOS7 to the "mainline" kernel rpms from http://elrepo.org http://elrepo.org Also, I only trust RAID1 + Crashplan.