LVM + MDADM...help
 

Hi I'm "playing" with my home server and his disks...
I want to set them with LVM + RAID (mdadm).

I've got 5 disks (SCSI disk)
During the installation I set only del first disk (non in LVM cause i'd like to set him later and not during the installation)
First disk: sda1 --> /
sda2 --> swap area

Finished the installation I configure LVM + RAID.

I want 3 disks in raid5 and 2 disks in raid1.

RAID5
mdadm --create /dev/md1 --level=5 --raid-devices=3 /dev/sdc /dev/sdd /dev/sde
pvcreate /dev/md1
vgcreate VGarray5 /dev/md1
lvcreate -l4339 -nLVarray5 VGarray5
mke2fs -T vfat /dev/md1
mkdir /Database
mount /dev/md1 /Database
cp /etc/mdadm/mdadm.conf /etc/mdadm/mdadm.conf.old
mdadm --brief --detail --verbose /dev/md1 >> /etc/mdadm/mdadm.conf

RAID1
sfdisk -d /dev/sda | sfdisk --force /dev/sdb
mdadm --create /dev/md0 --level 1 --raid-devices=2 missing /dev/sdb1
pvcreate /dev/md0
vgcreate VGboot /dev/md0
lvcreate -l2108 -nLVboot VGboot
mkfs.ext3 /dev/md0
mount /dev/md0 /mnt
cp -dpRx / /mnt
mdadm --brief --detail --verbose /dev/md0 >> /etc/mdadm/mdadm.conf

Then I modify /mnt/etc/fstab (remove /dev/sda1 /, add /dev/md0 /, add /dev/md1 /Database)
I've modified /mnt/etc/lilo.conf (boot=/dev/md0;root=/dev/VGboot/LVboot;raid-extra-boot="/dev/sda, /dev/sdb")
I've launched : lilo -v

I've copied /mnt/etc/fstab and /mnt/etc/lilo.conf on /etc/fstab and /etc/lilo.conf

Problem:
1 - If i launch vgdisplay and lvdiplay and I don't see any vg and lv. Why???
2 - When I restart the server, it do the boot only from sda1 and not from sdb1. If I remove sda1 the server don't start. Why?

1) Because you formatted the raid, not the logical volume.

2) Because you didn’t make additional grub entries to boot using sdb.

Raid HowTo: http://tldp.net/HOWTO/html_single/Software-RAID-HOWTO/

LVM HowTo: http://www.ibiblio.org/pub/Linux/doc...LVM-HOWTO.html

OK really thanks for info.
A quickly question: I use lilo (and not grub). I didn't understand what i have to do to make possible booting from sdb1.

I've configured the lilo.conf file in this manner:
boot=/dev/md0;
root=/dev/VGboot/LVboot;
raid-extra-boot="/dev/sda, /dev/sdb"

And I've launched the command : lilo -v

But what other operations I need to do?
Thanks a lot