Ric Wheeler wrote: > I think that is a really important knob to have. Not just for RAID > systems, but we use the FLUSH_CACHE on systems without barriers mainly > when we power down & do the unmounts, etc. > > If you hit a bad block during power down of a laptop, I can image that > have a worst case of (30?) seconds is infinitely better than multiple > minutes ;-) Fully finishing FLUSH CACHE requires command repetition. Not fully finishing FLUSH CACHE on shutdown means sure data loss. Given that FLUSH CACHE failure is very rare and it's repeatedly retried if and only if the device actively indicates failure, I'm not too sure. Also note that if FLUSH CACHE fails, you cannot even trust the FS journal. Things can get silently corrupt. -- tejun -- To unsubscribe from this list: send the line "unsubscribe linux-ide" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
