source: worked as a support engineer for a block storage company, witnessed hundreds of customers blowing one or both of their feet off with ZFS.
(Legitimate question: I manage several PB with ZFS and would like to know where I should be more cautious.)
There were legitimate bugs in ZFS that we hit. Mostly around ZIL/SLOG and L2ARC and the umpteen million knobs that one can tweak.
The phrasing of this tends me to believe that the customers set up ZFS in a 'strange' (?) way. Or was this a bug(s) with-in ZFS itself?
Because when people talk about Btrfs issues, they are talking about the code itself and bugs that cause volumes to go AWOL and such.
(All file systems have foot-guns.)
There was a _very_ nasty bug in the ZFS L2ARC that took out a few PB at a couple of large installations. This was back in 2012/2013 when multiple PBs was very expensive. Was a case of ZFS putting data from the ARC into the pool after the ZIL/SLOG had been flushed.
