>> Write barriers were introduced to give data guarantees with hard drives >> that have their write cache enabled. Unfortunately, not everything has >> been given barrier support. LVM and JFS do not have write barrier support. >> >> > > https://www.redhat.com/archives/dm-devel/2009-December/msg00079.html > > "Barriers are now supported by all the types of dm devices." > > Wunderbar! Now if the IBM team will add barrier support to JFS...