Comment 4 for bug 1864496

After discussions with mostly jam, thumper and babbageclunk, current theory is that because any raft write is followed by an fsync(), raft operations are very sensitive to IO load.

However, raft only stores application leadership (and perhaps one other thing, I forgot) for which we don't really care losing a few seconds/minutes of history in case of all controllers restarting simultaneously.

The juju team is investigating the possibility of getting rid of these fsync()s.