On Wed 2013-11-20 08:02:33, Howard Chu wrote: > Theodore Ts'o wrote: > >Historically, Intel has been really good about avoiding this, but > >since they've moved to using 3rd party flash controllers, I now advise > >everyone who plans to use any flash storage, regardless of the > >manufacturer, to do their own explicit power fail testing (hitting the > >reset button is not good enough, you need to kick the power plug out > >of the wall, or better yet, use a network controlled power switch you > >so you can repeat the power fail test dozens or hundreds of times for > >your qualification run) before being using flash storage in a mission > >critical situation where you care about data integrity after a power > >fail event. > > Speaking of which, what would you use to automate this sort of test? > I'm thinking an SSD connected by eSATA, with an external power > supply, and the host running inside a VM. Drop power to the drive at > the same time as doing a kill -9 on the VM, then you can resume the > VM pretty quickly instead of waiting for a full reboot sequence. I was just pulling power on sata drive. It uncovered "interesting" stuff. I plugged power back, and kernel re-estabilished communication with that drive, but any settings with hdparm were forgotten. I'd say there's some room for improvement there... 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-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
