> >>>>> "Pavel" == Pavel Machek <pavel@xxxxxxx> writes: > > Pavel> Does this sound like a fair summary? > > Pavel> Sector writes are atomic (ATOMIC-SECTORS) > Pavel> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > > I'd just like to point out that the all-or-nothing hardware sector > atomity thing is -- to a large extent -- a myth. It is a myth that linux filesystems depend on for safe operation :-(. > It is mostly true on SCSI class devices because various UNIX, RAID array > and database vendors have spent many years leaning very hard on the > drive manufacturers to make it so. > > But it's not a hard guarantee, you can't get it in writing, and it's not > in any of the standards. Hybrid drives with flash had potential to > close that particular loophole but those appear to be dead in the water. So "in practice it works but vendors will not guarantee that"? How much true is it for normal SATA drives? Are there some tests I can just run on a machine, powercycle it few times, and it tells me if my disk is non-ATOMIC-SECTORS? Pavel -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html -- To unsubscribe from this list: send the line "unsubscribe linux-doc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
