I have found it very difficult, if not impossible to mirror entire drives, rather than partitions. The reason is linux (still) needs a “non-mirrored” /boot partition, that has to exist outside of LVM.
I’m fairly certain there’s a way to use LVM to create mirrors, but I don’t know off of the top of my head (I use LVM on top of raid 5, but this method will also work with raid1).
(disclaimer, this is much more straightforward from the command line, as opposed to the yast tools)
To create LVM on top of raid1, I would advise you to ignore the suggestions and create your own layout. Create a 100MB partition on each disk to house /boot. I didn’t mirror /boot during install, it’s easy enough to do once the system is finished installing.
Then create a second partition on each disk and allocate the rest of the space. Set the partition type to raid for this second partion. You’ll have something like:
/dev/sda2 72GB RAID
/dev/sdb2 72GB RAID
Format /dev/sda1 to ext3 and mount it as /boot.
I think one of the options in the new partitioner allows you to create a raid volume. Use it create /dev/md0 as raid1.
The partitioner should have an LVM section. Here you can import /dev/md0 as your physical volume, create a volume group, and carve it up into whatever logical volumes you would like.
When you’re satisfied, continue with the installation.
Once the install is done, and you’re booted into the new system, it’s time to set up another mirror for /boot (so you can still boot the system if a drive fails).
Copy the data in /boot somewhere (MANDATORY):
rsync -av /boot /tmp/
(note the trailing slashes and lack thereof)
In parted, set the 100MB partition on /dev/sdb to be bootable an raid, and set /dev/sda1 to be raid also:
set 1 boot on
set 1 raid on
set 1 raid on
Now create /dev/md1 to house the new boot:
mdadm --create /dev/md1 --level=1 --raid-devices=2 /dev/sda1 /dev/sdb1
Now format the new array:
mke2fs -j /dev/md1
Mount it and copy the data back:
mount /dev/md1 /boot
rsync -av /tmp/boot/ /boot/
Now isntall grub to the MBR of both disks. Type grub and at the prompt:
It should return:
Setup grub on each disk:
(if the find gives you different output, use those for the root command instead)
Finally change /etc/fstab to mount /dev/md1 as /boot instead of the long /dev/disk/by-id/<string> device.