Installing Ubuntu 11.04 (Natty Narwhal) on a (fake) RAID0 SSD is not easy or straight-forward. This post describes how I got it all to work!

All changes I made was done through a terminal running from the Live media (USB or CD doesn't matter.)

My hard-drives were set up as follows:

/dev/mapper/sil_bhafabbhfgah2    /
/dev/mapper/sil_bhafabbhfgah1    /boot
/dev/sda1                        /var
/dev/sdb2                        /home
tmpfs                            /tmp

First we mount all hard-drives of the computer, in their own places:

$ sudo mount /dev/mapper/sil_bhafabbhfgah2  /target
$ sudo mount /dev/mapper/sil_bhafabbhfgah1  /target/boot
$ sudo mount /dev/sda1 /target/var
$ sudo mount /dev/sdb2 /target/home
$ sudo mount -o bind /proc /target/proc
$ sudo mount -o bind /sys /target/sys
$ sudo mount --rbind /dev /target/dev

It is important that all target partitions are mounted.

Now we do a chroot to the mount system.

$ sudo chroot /target /bin/bash

From here we need to install the dmraid package:

$ apt-get install dmraid

Now create the file device.map, used by GRUB.

$ echo "(hd0) /dev/mapper/sil_bhafabbhfgah" > /boot/device.map
$ cp /boot/device.map /boot/grub/

Change the device name (sil_bhafabbhfgah) to the appropriate for your system.

Now make sure GRUB is installed properly on the device:

$ grub-setup /dev/mapper/sil_bhafabbhfgah
$ update-grub

Now we might need to edit the GRUB configuration file: /boot/grub/grub.cfg. All lines looking something like:

set root='(hd6,msdos2)'

should be changed to:

set root='(hd0,msdos2)'

The actual line (the parts containing hd6 and msdos2) may of course be different.

The final thing to do is edit the /etc/fstab file, replacing all partion-references with UUIDs. Here is my fstab as example:

UUID=7e9f38de-b0b3-4eaf-8f5b-2f83b1a0674c /                  ext4    errors=remount-ro,noatime,nodiratime           0       1
none            /tmp            tmpfs   rw,nodev,nosuid,noatime,nodiratime,size=1024m,auto 0 2
none            /var/tmp        tmpfs   rw,nodev,nosuid,noatime,nodiratime,size=1024m,auto 0 2
# /var was on /dev/sda1 during installation
UUID=f1abaa31-25a9-414e-a7fa-f05ab492d5a0 /var               ext4    rw,noatime,auto,nodev,nodiratime               0       2
# /boot was on /dev/mapper/sil_bhafabbhfgah1 during installation
UUID=55a9024e-7806-4ec5-b68e-8e6065cf3587 /boot              ext4    rw,nodev,noexec,noatime,nodiratime,auto        0       2
# /home was on /dev/sdb2 during installation
UUID=2e0f5ff4-146d-492f-a6e7-cad460db79ee /home              ext4    rw,noatime,nodiratime,auto,nodev,nosuid        0       2
# /home/arrow/extra1 was on /dev/sdc2 during installation
UUID=4867268a-b6d1-469f-9190-b2807695b09e /home/arrow/extra1 ext4    rw,noatime,nodiratime,auto,nodev,nosuid        0       2
# /home/arrow/extra2 was on /dev/sdc2 during installation
UUID=73430b1a-91df-4908-bd16-4b1ed07876e4 /home/arrow/extra2 ext4    rw,noatime,nodiratime,auto,nodev,nosuid        0       2
# swap was on /dev/sdc1 during installation
UUID=68a20ae0-12e0-413d-b80f-b39fd42e3153 none            swap    sw              0       0
/dev/fd0        /media/floppy0  auto    rw,user,noauto,exec,utf8 0       0

Now reboot, and keep your fingers crossed!

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