ff3ef8ee_Jepsen__Write_concern
[Also called] FSYNC_SAFE [Safe?] Unsafe: ditto, constraint violations & rollbacks [Write concern] 
Fsynced
U n a c k n o w l e d g e d
A c k n o w l e d g e d ( n e w d e f a u l t )
J o u r n a l e d
F s y n c e d
R e p l i c a A c k n o w l e d g e d
M a j o r i t y
Jepsen
Write concern