> > did you raise speed_limit_min?? > > if you didn't then you're probably being hit by the 'only use idle io' > problem. That's fixed it! It's now going along at around 5.7 MB/s which isn't huge but is around 11 times what it was. Many thanks. But I'm a bit surprised this makes a difference because there is no other real IO going on. John - 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