Ubuntu Server 6.06 LTS RAID 1 mirror and LVM

From LinuxNewbie

Contents

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Setup RAID 

$ cat /proc/diskstats

To set up a partitition, run fdisk twice, each one for each disk and do the following: 

$ fdisk /dev/hdX

Type ‘n’, create a logic partition. Write down the cylinders you used because the partitions on the others disk have to fill the same exact ammount of space. Set it’s type to ‘fd’ by typing t. Finally, save the changes by typing w.

I’ll remember once again than you have to follow this procedure twice, once of earch hard drive.

Now it’s time to create the virtual disk. Make sure mdadm is installed. If it isn’t, I can lend you a hand on that. Just do

Then, fire up the following command 

$ mdadm --create --verbose /dev/md0 --level=1 --raid-devices=2 /dev/hda1 /dev/hdc1
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Missing MDx devices

If you should encounter messages like: mdadm: error opening /dev/md1: No such file or directory when you try to create several arrays you will have to create the devices on your own using 

mknod /dev/md0 b 9 0
mknod /dev/md1 b 9 1
mknod /dev/md2 b 9 2
...
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Create /boot 

$ fdisk /dev/md0

Create a new partition with 'n', make it a primary and partition number 1.
Change the type to Linux with 't' and 83.

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grub boot loader on both hard drives

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LVM

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credits

RAID configuration

How to fix missing MD device entries

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