How to create md device permanently
 

HI,

i have created some mirrored devices using the mdadm command.
# cat /proc/mdstat
Personalities : [raid1]
md3 : active raid1 sdr[1] sdn[0]
8388544 blocks [2/2] [UU]

unused devices: <none>
But after reboot the server md devices are not accessable.
root@B******L385 ~]# cat /proc/mdstat

Personalities :

unused devices: <none>
[root@*****L385 hp_fibreutils]# cat /etc/mdadm.conf

DEVICE /dev/sd[klmn] /dev/sd[opqr]

ARRAY /dev/md3 level=raid1 num-devices=2 UUID=845d1ee4:22823587:5dc1816f:54b474de

ARRAY /dev/md2 level=raid1 num-devices=2 UUID=19dfbd17:86e4038c:c82a9596:69212b25

ARRAY /dev/md1 level=raid1 num-devices=2 UUID=2175df74:6fc78b59:c6a3cba2:1ef3b12d

ARRAY /dev/md0 level=raid1 num-devices=2 UUID=c056e428:137fad3c:8d0f7800:8784e2f8

could you please let me know how what i have to do for solving this issue.


regards
josin

Hi,

Which distro are you using? It sounds like your system initialization script isn't building the array for you. On RHEL, the /etc/rc.d/rc.sysinit script should build your array(s) from the /etc/mdadm.conf file. Does your script look for the mdadm.conf file and process it if it exists?

Ian

Are these SAN luns? If so you might want to add some udev rules to manually bind them first so your device name doesn't change after boot...then md.