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== Root on software RAD+LVM == == Root on software RAID+LVM ==

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 RAID+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