Delete all but the top line
DEVICE /dev/sda* /dev/sdb*
mdadm --examine --scan >> /etc/mdadm/mdadm.conf
Your final file should look like:
DEVICE /dev/sda* /dev/sdb* ARRAY /dev/md0 level=raid1 num-devices=2 UUID=4d58ade4:dd80faa9:19f447f8:23d355e3 devices=/dev/sda1,/dev/sdb1 ARRAY /dev/md1 level=raid1 num-devices=2 UUID=3f1bdce2:c55460b0:9262fd47:3c94b6ab devices=/dev/sda5,/dev/sdb5 ARRAY /dev/md2 level=raid1 num-devices=2 UUID=7dfd7fcb:d65245d6:f9da98db:f670d7b6 devices=/dev/sdb6,/dev/sda6
Note - you need the top DEVICE line and the lower devices lines
Test boot from both drives
Kill a drive and see if you get a email about the event.
Write up a step by step procedure to restore from a drive outage. (send a copy this way for this page!)
You should be all finished!
Please send notes of any typos/corrections to the email address below.
Special thanks to Onni Koskinen of Finland, whose gentle yet expert emails removed several glaring errors on this page and resulted in a vastly improved document.
Moved to it's own page Growing_Partitions_and_file_systems
First, look at proc:
cat /proc/mdstat Personalities : [raid1] md1 : active raid1 sda2(F) sdb2 70645760 blocks [2/1] [_U] md0 : active raid1 sda1 sdb1 9767424 blocks [2/2] [UU] unused devices: <none>
This shows raid md1 has drive sda2 stopped with a fault.
To re- add:
# mdadm /dev/md1 -r /dev/sda2 mdadm: hot removed /dev/sda2 # mdadm /dev/md1 -a /dev/sda2 mdadm: re-added /dev/sda2
Now you will see it regenerate in mdstat:
Personalities : [raid1] md1 : active raid1 sda2 sdb2 70645760 blocks [2/1] [_U] [>....................] recovery = 0.3% (268800/70645760) finish=21.8min speed=53760K/sec md0 : active raid1 sda1 sdb1 9767424 blocks [2/2] [UU] unused devices: <none>
If you have to re-add a drive more than once you need to find out why.
Yes, IF you install Grub on both drives and your BIOS will roll over to the first bootable drive.
mount -o loop /tmp/myinitrd /mnt/myinitrd
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