Tag: Software Raid

If you ever get this:

mdadm: error opening /dev/md0: No such file or directory

do:

ls -la /dev/md0

If the file does not exist create it as follows: (I am assuming your kernel already supports software raid)

mknod /dev/md0 b 9 0

I created identical partition tables on my two SATA disks or rather I made the/dev/sdb identical to /dev/sda because my current root file system resides in /dev/sda2 and /boot/ is on /dev/sda1
/dev/sda1 == 200MB /boot/
/deb/sda2 == 2GB /
/deb/sda2
/dev/sdb1
/deb/sdb2
/deb/sdb3
I then ran the following command.

mdadm --create --verbose /dev/md0 --level=1 --raid-devices=2 /dev/sda3 dev/sdb3

To make sure everything is running properly:

cat /proc/mdstat
Personalities : [linear] [raid0] [raid1] [raid5] [multipath]
md0 : active raid1 sdb3[1] sda3[0]
196996992 blocks [2/2] [UU]
[==>..................]  resync = 10.3% (20347136/196996992) finish=46.4min speed=63318K/sec
unused devices: 

The next step is that when the resync is finished is to use lvm and set myself up some areas to work in.