I remember the first time I deployed ceph, would have been around 2010 or 2011, had some really major issues which would nearly resulted in data loss and due to someone else not realizing what "this cluster is experimental, do not store any important data here" meant, the data on ceph was the only copy of the irreplaceable data in the world, loosing the data would have been fairly catastrophic for us.

I ended up on the ceph IRC channel and eventually had Sage helping me fix the issues directly, helping me find bugs and writing patches to fix them in realtime.

Super amazingly nice guy that he was willing to help, never once chastised me for being so stupid (even though I was), also wicked smart.