On 05/12/17 09:41, Jeremy Graham wrote: > $ mdadm --version > mdadm - v3.4 - 28th January 2016 Won't do any harm to try the latest version, but this could well be the problem. https://raid.wiki.kernel.org/index.php/Linux_Raid That'll tell you where to download the latest mdadm from. This sounds a typical problem that people have had, and iirc upgrading mdadm often fixes it. Let us know what the latest mdadm does, and if it doesn't fix it, someone else will be along with more advice. Cheers, Wol -- 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