Hi, I have a system with two IDE controllers running RAID1. As a test I powered down, removed one drive (hdc), and powered back up. System came up fine, so powered down installed a new drive (hdc) And powered back up. /proc/mdstat indicatd RAID1 active with hda only. I thought it would Auto add the new hdc drive... Also when I removed the new drive and added The original hdc, the swap partitions were active hda and hdc but only hda on the other partitions. I has to add the other hdc partitions with mdadm -a. My mdadm.conf looks like; # mdadm.conf written out by anaconda DEVICE partitions MAILADDR root ARRAY /dev/md1 super-minor=1 ARRAY /dev/md0 super-minor=0 ARRAY /dev/md3 super-minor=3 ARRAY /dev/md2 super-minor=2 Shouldn't there be more information for mdadm to work with? How do you replace a failed drive and have it auto-configured? TIA Gerald