You need to "reinsert" it manually. It's very well explained in this Howto: http://www.tldp.org/HOWTO/Software-RAID-HOWTO.html See the section 6.3 to know how to add the new drive to the array. I tested this 3 days ago :) ----- Original Message ----- From: "Gerald Waugh" <gwaugh at frontstreetnetworks.com> To: "CentOS mailing list" <centos at centos.org> Sent: Saturday, May 21, 2005 5:09 PM Subject: [CentOS] Software RAID CentOS4 > 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 > > > _______________________________________________ > CentOS mailing list > CentOS at centos.org > http://lists.centos.org/mailman/listinfo/centos >