On Wed, May 29, 2019 at 01:23:32AM -0400, Theodore Ts'o wrote: > If you have protection against sudden shutdown, then nobarrier is > perfectly safe --- which is to say, if it is guaranteed that any > writes sent to device will be persisted after a crash, then nobarrier > is perfectly safe. So for example, if you are using ext4 connected to > a million dollar EMC Storage Array, which has battery backup, using > nobarrier is perfectly safe. And while we had a few oddities in the past in general any such device will obviously not claim to even have a volatile write cache, so nobarrier or this broken proposed mount option won't actually make any difference.
