Hi, after switching from i386 to x86_64, my software RAID-1 partitions were not discovered automatically as they should have been. It seems that the physical devices (/dev/sda and /dev/sdb) have UUIDs stored from when I first tried to create the array, and that may have confused the automatic detection.
My first try (a couple years ago, when the disks were new) had been to create a RAID-1 from the two disks and to partition that array later as needed. But that didn't work, so I created partitions on the disks and then created RAID-1 arrays from these partitions. Now it looks like this: Device Boot Start End Blocks Id System /dev/sda1 1 9119 73248336 fd Linux raid autodetect /dev/sda2 9120 29788 166023742+ fd Linux raid autodetect /dev/sda3 29789 36483 53777587+ fd Linux raid autodetect Device Boot Start End Blocks Id System /dev/sdb1 1 9119 73248336 fd Linux raid autodetect /dev/sdb2 9120 29788 166023742+ fd Linux raid autodetect /dev/sdb3 29789 36483 53777587+ fd Linux raid autodetect cat:/etc/exim4# mdadm --examine --scan /dev/sda1 ARRAY /dev/md0 level=raid1 num-devices=2 UUID=ca34e190:39db09f0:390edcc4:35d74b5f cat:/etc/exim4# mdadm --examine --scan /dev/sdb1 ARRAY /dev/md0 level=raid1 num-devices=2 UUID=ca34e190:39db09f0:390edcc4:35d74b5f cat:/etc/exim4# mdadm --examine --scan /dev/sda2 ARRAY /dev/md1 level=raid1 num-devices=2 UUID=9f9a753b:eb70a81c:5ff8d522:9ec3586b cat:/etc/exim4# mdadm --examine --scan /dev/sdb2 ARRAY /dev/md1 level=raid1 num-devices=2 UUID=9f9a753b:eb70a81c:5ff8d522:9ec3586b cat:/etc/exim4# mdadm --examine --scan /dev/sda3 ARRAY /dev/md2 level=raid1 num-devices=2 UUID=ae296907:7c3dc6ef:763a7645:40ee5e12 cat:/etc/exim4# mdadm --examine --scan /dev/sdb3 ARRAY /dev/md2 level=raid1 num-devices=2 UUID=ae296907:7c3dc6ef:763a7645:40ee5e12 cat:/etc/exim4# mdadm --examine --scan /dev/sda ARRAY /dev/md0 level=raid1 num-devices=2 UUID=c5460893:6fe1b92f:8d76d626:2a523555 cat:/etc/exim4# mdadm --examine --scan /dev/sdb ARRAY /dev/md0 level=raid1 num-devices=2 UUID=c5460893:6fe1b92f:8d76d626:2a523555 Note that the physical devices /dev/sda and /dev/sdb have UUIDs stored. How do I remove these UUIDs? The automatic detection created these entries in /etc/mdadm/mdadm.conf (I commented them out later): # definitions of existing MD arrays #ARRAY /dev/md0 level=raid1 num-devices=2 UUID=c5460893:6fe1b92f:8d76d626:2a523555 #ARRAY /dev/md0 level=raid1 num-devices=2 UUID=ca34e190:39db09f0:390edcc4:35d74b5f #ARRAY /dev/md1 level=raid1 num-devices=2 UUID=9f9a753b:eb70a81c:5ff8d522:9ec3586b #ARRAY /dev/md2 level=raid1 num-devices=2 UUID=ae296907:7c3dc6ef:763a7645:40ee5e12 This left me with a /dev/md0 across both disks, fdisk -l showing non-existent devices /dev/md0p1, /dev/md0p2 etc., the data inaccessable, a resync started automatically and /dev/md1 and /dev/md2 broken. After the resync was done, I stopped all md devices and added the partitions to the md devices manually. Fortunately, I didn't lose any data ... Now I have /dev/md0, /dev/md1 and /dev/md2 as they were before. The entries in /etc/mdadm/mdadm.conf probably should look like this: ARRAY /dev/md0 level=raid1 num-devices=2 metadata=00.90 UUID=ca34e190:39db09f0:390edcc4:35d74b5f ARRAY /dev/md1 level=raid1 num-devices=2 metadata=00.90 UUID=9f9a753b:eb70a81c:5ff8d522:9ec3586b ARRAY /dev/md2 level=raid1 num-devices=2 metadata=00.90 UUID=ae296907:7c3dc6ef:763a7645:40ee5e12 Does this look correct? How do I remove the UUIDs from /dev/sda and /dev/sdb to prevent the automatic detection from being confused again? -- "Don't let them, daddy. Don't let the stars run down." http://adin.dyndns.org/adin/TheLastQ.htm -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
