mdadm create raid change name

Posted on 2012-03-17
Medium Priority
Last Modified: 2012-03-18
in ubuntu, I created a raid with this command

mdadm -C /dev/md0 --level=raid1 --raid-devices=2 /dev/sdb /dev/sdc

And works fine, but when I reboot the system, the new array are in /dev/md127 (I hope that was in /dev/md0) Why? and how can I fix it to maintain the same pointer /dev/md0 that in the creation command?

Question by:lnrivera
LVL 81

Expert Comment

ID: 37734064
df -k
more /etc/mdadm.conf
more /etc/fstab

your initial setup might be referring or is using /dev/md127 to assemble the two drives you referenced.

There is no information on what you have currently.
LVL 43

Accepted Solution

ravenpl earned 2000 total points
ID: 37734533
This is new kernel "feature".

You need to create proper /etc/mdadm.conf

In Your case execute (as root)
# echo ’DEVICE /dev/sd*[a-z]’ > /etc/mdadm.conf
# mdadm --detail --scan >> /etc/mdadm.conf
edit the /etc/mdadm.conf and change /dev/md127 to /dev/md0
Now either wait for new kernel update, or force rebuilding initramfs
# update-initramfs -u

Author Closing Comment

ID: 37734563

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