> I've done this on raid-1. I assume the procedure for raid-0 will be the
> same.
Sadly, it's not that simple. The difference being that each partition on a
RAID-1 contains a complete copy of the filesystem, so files can be read off the
physical device by lilo, whereas each partition on a RAID-0 effectively contains
junk until combined with the other partitions by the RAID code. lilo cannot, and
is unlikely ever to, read the essential system files from a RAID-0 (or RAID-5)
the way that is now possible with RAID-1.
What this means is that you are going to have to keep the essential system files
off the RAID-0 array. Effectively, this means putting /boot in its own (non-RAID
or RAID-1) partition. Fortunately, you already have a 60Mb partition doing
nothing once you get root onto RAID, so you could use this as a very generous
/boot partition (another option would be to leave root on this partition and
mount the larger non-essential sections of your filesystem on RAID-0s, but we'll
stick as close as possible to the original plan for now).
This is a little unorthodox, but try the following (I am assuming you have
already got a working linux filesystem on /dev/md0, mounted on /mnt, as
described). For the purposes of this explanation I will assume that your 60Mb
installation partition is /dev/hda1, but you will need to change this to
whatever it really is.
1. Copy the files in /boot to /
2. Edit /etc/lilo.conf so that it is reading the files it needs from / rather
than /boot, e.g.
boot=/dev/hda # Change to whatever device you are using
map=/map
install=/boot.b
prompt
timeout=50
image=/vmlinuz # Change to whatever your image's filename is
label=linux
root=/dev/md0
read-only
image=/vmlinuz # Change to whatever your image's filename is
label=backup
root=/dev/hda1 #Change to the partition number of your little installation
partition
read-only
3. Run lilo
4. Edit /mnt/etc/lilo.conf:
boot=/dev/hda # Change to whatever device you are using
map=/boot/map
install=/boot/boot.b
prompt
timeout=50
image=/boot/vmlinuz # Change to whatever your image's filename is
label=linux
root=/dev/md0
read-only
5. Edit /mnt/etc/fstab so that /dev/md0 is shown as / and /dev/hda1 (or whatever
you 60Mb partition is) is shown as /boot.
6. Reboot. As long as you have raid support built into your kernel or included
in your initrd, the system should boot up with /dev/md0 on root and /dev/hda1 on
/boot.
7. Try running lilo again. It will be using the lilo.conf that we edited second
this time (as that now appears at /etc/lilo.conf). If this works, you will be
able to continue using this system, in which case you can lose all the
unnecessary files in /boot. So:
8. Delete all the sub-directories (the old system filesystem) under /boot, so
that only the /boot files remain.
Cheers,
Bruno Prior [EMAIL PROTECTED]
> -Original Message-
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED]]On Behalf Of David Cunningham
> Sent: 03 December 1999 02:26
> To: Jim Ford; linux-raid
> Subject: Re: Help on root fs using raid-0
>
>
> I've done this on raid-1. I assume the procedure for raid-0 will be the
> same. Here is how I do it. I'm not guaranteeing this is the best way:
>
> First I'll make some assumptions. First you would like to boot to your root
> md0 filesystem. Second, you have a kernel that is new enough to support
> booting on raid and the raid-0 personality is compiled into the Kernel.
> Third, your copy of lilo is new enough to support booting to md devices.
> And 4th, you're using IDE drives.
>
> 1. Using fdisk make the partition id's of all raid partitions (on both
> disks) "fd". Use the "t" option in fdisk to do this.
> 2. Edit /etc/lilo.conf so that root=/dev/md0 and boot points to a valid
> boot drive. (/dev/hda in my case.)
> 3. Drop to your command prompt and run lilo. (Ex. Type "lilo" followed by
> enter at the prompt.)
> 4. Reboot.
>
> Be sure to have a boot disk handy. If this fails for any reason you'll need
> it to boot your computer. Additions or comments on this nano-procedure are
> welcome.
>
> Good Luck.
>
> - Original Message -
> From: Jim Ford
> To: linux-raid
> Sent: Thursday, December 02, 1999 10:59 AM
> Subject: Help on root fs using raid-0
>
>
> I'm stuck!
>
> I've got two 1gig disks that I want to concatenate together using raid-0 and
> mount as / with Slackware 7 installed.
> I've created a minimal installation on a 60meg partition and used this to
> create a full installation on a raid-0 partition - /dev/md0, which I can
> mount and umount on /mnt to my heart's content (but which isn't much use
> there)!
> For 64,000 dollars - how can I mount /dev/md0 as / ?
> I've read the docs, but find them quite opaque. Surely there's an simple
> way!
>
> Regards: Jim Ford
>
>
>
