Re: Root on RAID

[Alvin Oga <aoga@Maggie.Linux-Consulting.com>]

hi ya george

to do "root raid".. you need to use the "raid" partition type
and NOT ext2 ....

you might want root raid5...so that if one disk dies...that you can 
still boot off of the remaining disks

you might want to just do root raid1...so that if one disk dies...
you can still boot off the "mirror"
	- lot easier to install/configure than root raid5

c ya
alvin
http://www.Linux-Consulting.com/Raid
-
- http://www.Linux10.org - Linux 10th Anniversay Picnic/BBQ
-

On Wed, 1 Aug 2001, George Karaolides wrote:

> Hi,
> 
> I'm trying to install a system with root fs on RAID.
> 
> I have done this successfully on Turbolinux 6.1 before, but don't seem to
> be able to get it to work under Turbolinux.
> 
> Procedure followed (based on the Boot+Root+Raid+Lilo-HOWTO):
> 
> - Get and install kernel version 2.2.19 source code (Debian package)
> - Patch with appropriate patch from kernel.org (I found out later that 
> a Debian package of a raid patch is available in the testing
> distribution).
> - Make and install a kernel image using make-kpkg.
> - Boot with new RAID-aware kernel
> - Make RAID arrays with disk on which current installation resides as 
> "failed-disk"
> - mke2fs on arrays
> - Mount arrays under /mnt/raid with the same hierarchy as they will be
> mounted in the root-on-RAID system
> - Copy filesystems to arrays:
>   prompt# tar cf - -C / bin | tar xvf - -C /mnt/raid 
>   # tar cf - -C / dev | tar xvf - -C /mnt/raid 
>   mkdir /mnt/raid/proc
>   etc etc
> - Edit /mnt/root/etc/lilo.conf 
> - run lilo to install an MBR on one (and later more than one) disks in the
> array:
>   prompt# chroot /mnt/raid lilo
> - Edit /mnt/raid/etc/fstab to reflect root-RAID system fs structure
> - Reboot.
> 
> This procedure has been completely successful on Turbolinux 6.1, but on
> Debian 2.2r3 (potato) I have been unable to boot.
> 
> lilo reports successful installation, but on reboot lilo reaches the
> error state LI which, according to the LILO doc, indicates a geometry
> mismatch.
> 
> Contents of /mnt/root/etc/lilo.conf follow.  This was done according to 
> the above HOWTO.
> 
> /dev/md0 contains the /boot filesystem.
> /dev/md2 contains the / (root) filesystem.
> 
> # Begin lilo.conf
> 
> disk=/dev/md2
> bios=0x80
> cylinders=8761
> heads=64
> sectors=32
> partition=/dev/md0
> start=32 
> 
> map=/boot/map
> install=/boot/boot.b
> lba32
> prompt
> root=/dev/md2
> default=linux
> 
> image=/boot/vmlinuz
>         label=linux
>         read-only
> 
> image=/boot/vmlinuz.old
>         label=linux-old
>         read-only
> 
> # End lilo.conf
> 
> Help would be greatly appreciated...
> 
> Best regards,
> 
> George Karaolides       8, Costakis Pantelides St.,
> tel:   +35 79 68 08 86                   Strovolos, 
> email: george@karaolides.com       Nicosia CY 2057,
> web:   www.karaolides.com      Republic  of Cyprus
> 
> 
> 
> 
> -- 
> To UNSUBSCRIBE, email to debian-user-request@lists.debian.org 
> with a subject of "unsubscribe". Trouble? Contact listmaster@lists.debian.org
>