seastarer·il y a 2 mois·discussIt's more correct to use O_DSYNC in addition to O_DIRECT. This adds FUA to the disk write if the disk requires it for durability.
seastarer·il y a 7 mois·discussIt is actually very cheap if done right. Enterprise SSDs have write-through caches, so an O_DIRECT|O_DSYNC write is sufficient, if you set things up so the filesystem doesn't have to also commit its own logs.
seastarer·il y a 8 mois·discussDo these calculations take into account the lengthening of the days due to tidal friction?