> The third drive will never be on site > (think about the risk), but that just > means that the array will grow from > 2->1 and then from 1->2 instead > of from 2->3 and 3->2. I'd argue your risk from a failing disk during resync is significantly greater then your risk of facility failure during the same window. Not sure what drives are pricing where you are but adding a forth into the rotation is cheap insurance. Two for the array, one syncing, one offsite. Some recent blogs ( http://storagemojo.com/2010/02/27/does-raid-6-stops-working-in-2019/ for example ) suggest that modern drives will encounter unrecoverable read errors approx every 12TB read. That works out to approx every 6-12 resyncs based on 1-2TB drives. -- Drew -- 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
