Hi, When I use mdadm v3.1.3, seems the spare group function can?t work. As I remember, this function in mdadm 2.6.5 works well. Here is some info from /etc/mdadm.conf ? ARRAY /dev/md0 level=raid1 spare-group=test11 ARRAY /dev/md1 level=raid1 spare-group=test11 ? And mdmonitor service is in running status: [root@localhost tmp]# ps aux |grep mdadm root 1794 0.0 0.0 6852 760 ? Ss 16:52 0:00 mdadm -F -y -f -s -i /var/run/mdadm/mdadm.pid --delay=10 There is one spare disk in md0, and no spare in md1, if I fail the member disk in md1, the spare in md0 won?t migrate into md1. Thank you very much. Regards, Johnson Yan -- 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