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Comment: Lenny support SoftwareRaidRoot... screenshots
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## Auto-converted by kwiki2moinmoin v2005-10-07
There needs to be a method to install Debian onto a software RAID
mirror. This has been lacking for years it seems. Others have
figured it out, why hasn't Debian?
## page was renamed from DebianInstallerSoftwareRaidRoot
#language en
Line 6: Line 4:
Tools like mdadm and raidtools2 are out there. However the current
kernel-images don't even support having "/" on a ["RAID1"] mirror.
Lenny supports having the root and {{{/boot}}} partition on RAID volume. Actually, you can have root on RAID1+LVM partition.

This page contains some screenshots to demonstrate it.

== Root on software RAD+LVM ==
In this example, we use virtual machine ([:QEMU:qemu] or [:KVM:kvm])... we can play, and break them ;-)
 {{{
$ sudo apt-get install kvm

$ qemu-img create -f qcow2 hda.qcow2 4G
Formatting 'hda.qcow2', fmt=qcow2, size=4194304 kB

$ qemu-img create -f qcow2 hdb.qcow2 4G
Formatting 'hdb.qcow2', fmt=qcow2, size=4194304 kB

$ kvm -hda hda.qcow2 -hdb hdb.qcow2 -cdrom debian-lenny-i386-netinst.iso -boot d
}}}

Of course, you need to download a cdrom image.

==== Root on RAID+LVM example ====
Those few screenshots show how to install root on lvm on raid :

Once you have reach DebianInstaller partitioning screen...

Choose manual partitioning, then on each disk, manually create a partition (same size on both disks).

===== Create partitions for RAID =====
 * {{{Use as "Physical volume for Raid"}}} : [[BR]] inline:00.gif

===== Configure RAID =====
 * We have a raid partition on each disk: [[BR]] inline:01.gif
 * Choose the type of multidisk device to be created: [[BR]] inline:02.gif
 * We have two partition: [[BR]] inline:03.gif
 * (In this example, we have no spare partition).
 * Let's select the partitions to use: [[BR]] inline:04.gif
 * That's it ! [[BR]] inline:05.gif

===== Configure LVM =====
 * Let's configure the Logical volume manager: [[BR]] inline:06.gif
 * First create a volume group: [[BR]] inline:07.gif
 * Here, I chose the name ''vg1'' for the group: [[BR]] inline:08.gif
 * We have only one raid device: [[BR]] inline:09.gif
 * Let's create the ''logical volume'' (kind pf partitions): [[BR]] inline:10.gif
 * Our Logical volume (LV) will use some disk space from ''vg1'' (which belongs to ''md0''): [[BR]] inline:11.gif
 * I named my partition ''foobar_root'': [[BR]] inline:12.gif
 * In this example, we wont split the filesystem (we won't even bother to create a swap, which is a bad idea), so I use all the disk space. (which again isn't a good idea, since it's so easy ro resize a partition with LVM) [[BR]] inline:13.gif
 * Finish: [[BR]] inline:14.gif

===== Use the LVM volumes =====
 * Let's assign and format the volumes (''partitions''): [[BR]] inline:15.gif
 * As usually... [[BR]] inline:16.gif
 * Done! [[BR]] inline:17.gif

===== Install the bootloader (lilo) =====
''At the end of the installation...''
 * because we have root on RAID, DebianInstaller automatically switch to [:LILO:lilo]: [[BR]]inline:20.gif

===== Reboot Debian =====
 * Debian is booting: [[BR]] inline:oo.gif


==== Using D-I rescue, to reinstall lilo ====
Thanks to DebianInstaller's rescue mode, it's very easy to recover a problem :

 * Simply boot on the CD, and choose ''rescue'' mode, then after the usual DI prompt, you get : [[BR]] inline:rescue00.gif
 * Then: [[BR]] inline:rescue01.gif
## * Yeah, ok : inline:rescue02.gif
 * Reinstall/ rescue/restore lilo : [[BR]] inline:rescue03lilo.gif

== See also ==
 * Recover a !DegradedArray RAID array ~-[[BR]] [http://lists.debian.org/debian-user/2008/10/msg01989.html]-~
 * DebianInstaller
 * http://www.tldp.org/HOWTO/RAID-HOWTO/
 * http://www.tldp.org/HOWTO/LVM-HOWTO/

Lenny supports having the root and /boot partition on RAID volume. Actually, you can have root on RAID1+LVM partition.

This page contains some screenshots to demonstrate it.

Root on software RAD+LVM

In this example, we use virtual machine ([:QEMU:qemu] or [:KVM:kvm])... we can play, and break them ;-)

  • $ sudo apt-get install kvm
    
    $ qemu-img create -f qcow2 hda.qcow2 4G
    Formatting 'hda.qcow2', fmt=qcow2, size=4194304 kB
    
    $ qemu-img create -f qcow2 hdb.qcow2 4G
    Formatting 'hdb.qcow2', fmt=qcow2, size=4194304 kB
    
    $ kvm -hda hda.qcow2  -hdb hdb.qcow2  -cdrom debian-lenny-i386-netinst.iso -boot d

Of course, you need to download a cdrom image.

Root on RAID+LVM example

Those few screenshots show how to install root on lvm on raid :

Once you have reach DebianInstaller partitioning screen...

Choose manual partitioning, then on each disk, manually create a partition (same size on both disks).

Create partitions for RAID
  • Use as "Physical volume for Raid" : ?BR inline:00.gif

Configure RAID
  • We have a raid partition on each disk: ?BR inline:01.gif

  • Choose the type of multidisk device to be created: ?BR inline:02.gif

  • We have two partition: ?BR inline:03.gif

  • (In this example, we have no spare partition).
  • Let's select the partitions to use: ?BR inline:04.gif

  • That's it ! ?BR inline:05.gif

Configure LVM
  • Let's configure the Logical volume manager: ?BR inline:06.gif

  • First create a volume group: ?BR inline:07.gif

  • Here, I chose the name vg1 for the group: ?BR inline:08.gif

  • We have only one raid device: ?BR inline:09.gif

  • Let's create the logical volume (kind pf partitions): ?BR inline:10.gif

  • Our Logical volume (LV) will use some disk space from vg1 (which belongs to md0): ?BR inline:11.gif

  • I named my partition foobar_root: ?BR inline:12.gif

  • In this example, we wont split the filesystem (we won't even bother to create a swap, which is a bad idea), so I use all the disk space. (which again isn't a good idea, since it's so easy ro resize a partition with LVM) ?BR inline:13.gif

  • Finish: ?BR inline:14.gif

Use the LVM volumes
  • Let's assign and format the volumes (partitions): ?BR inline:15.gif

  • As usually... ?BR inline:16.gif

  • Done! ?BR inline:17.gif

Install the bootloader (lilo)

At the end of the installation...

  • because we have root on RAID, DebianInstaller automatically switch to [:LILO:lilo]: ?BRinline:20.gif

Reboot Debian
  • Debian is booting: ?BR inline:oo.gif

Using D-I rescue, to reinstall lilo

Thanks to DebianInstaller's rescue mode, it's very easy to recover a problem :

  • Simply boot on the CD, and choose rescue mode, then after the usual DI prompt, you get : ?BR inline:rescue00.gif

  • Then: ?BR inline:rescue01.gif

  • Reinstall/ rescue/restore lilo : ?BR inline:rescue03lilo.gif

See also