Hi Neil and all, Is there anyway to know: 1. How often does a raid start to resync? 2. How many bytes did it resync? If not, for the first one, I think we cound add field into mddev like resync_counter, increase when resync done, and annother field into md_rdev to track how many bytes synced to the outdated disk? Regards, Jack -- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html