Hi! > This is an updated implementation of journal guided resync, intended to be > suitable for production systems. This feature addresses the problem with RAID > arrays that take too long to resync - similar to the existing MD write-intent > bitmap feature, we resync only the stripes that were undergoing writes at the > time of the crash. Unlike write-intent bitmaps, our testing shows very little > performance degredation as a result of the feature - around 3-5% vs around 30% > for bitmaps. Good. Now when fs know about raid and wise versa... perhaps it is time to journal surrounding data on stripe so that power fails do not destroy data on degraded raid5? 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-ext4" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
