Well, it all works fine for me with raid0 on root and raid1 on boot. I'm using kernel-2.4 on sparc32. I know you have to jump through a ton of hoops on 2.2, but 2.4 and 2.6 are fairly painless:
1) Make sure the hard drive partitions are type 'fd' in fdisk. This
tells the kernel to look for the raid superblock and construct the raid
at boot (instead of waiting for raidstart or mdadm to be called).
2) construct the raid using mdadm or raidtools. If you did this before
setting the partition type, it's safe to change the partition type after
the raid is constructed. Additionally, make sure you tell mdadm or
raidtools to create an md superblock on the array.
Here's my silo.conf:
---
partition = 1
root = /dev/md1 # This is raid0
timeout = 20
image = /boot/kernel
label = linux
image = /boot/image-2.4.21-smp
label = linux-2.4.21-smp
image = /boot/image-2.4.25-smp
label = linux-2.4.25-smp
image = /boot/image-2.4.29-sparc
label = linux-2.4.29-sparc-smp
---
On Thu, 2005-03-10 at 15:27 -0600, Pilage wrote:
> i tried doing this for hours but could never get it to work.
>
> these links seem to have some good info(and/or links to info)
> http://www.ultralinux.org/faq.html#q_5_40
> http://forums.gentoo.org/viewtopic-t-8813-highlight-raid.html
> found this link just now i may go over it more thoroughly here shortly
> http://forums.gentoo.org/viewtopic-t-304150-highlight-raid.html
>
> what i found is the community is solidly divided on this. half will say it
> is impossible and be adamant about that. others will say they did it but
> are not truly booting off the raid they boot one side of the mirror and do
> some unmounting and re mounting to get it to work. then there are a few
> that swear they have done the true boot off the raid but can't seem to
> explain how, whether it be they are not at the box or it was an old box
> they dont have anymore or they will give you one line of a setting to add
> to silo.conf and say that should do it. i tried for weeks in chat rooms
> and forums to get a complete answer but was never able to get it to boot
> off the raid.
> right now i periodically copy sda to sdb, i know its a sad way to do it
> but thats what i got.
>
> if others have a working version can we pleeeeaaase have a complete answer
> of how to do it?
>
> thanks,
> pilage
>
>
>
>
> On Thu, 10 Mar 2005 21:03:17 +0100, Lieven Van Acker
> <[EMAIL PROTECTED]> wrote:
>
> > Installed Gentoo-2004.3 on sparc Blade 1000.
> > All works like a charm, until I started configuring software raid:
> >
> > the SILO loader seems to have problems installing when running / on
> > raid1:
> >
> > This is what I did:
> >
> > * Installed Gentoo on sda1 (/), sda2 (swap), sda4 (/var)
> > * Kernel including md and raid1 support (using genkernel --menuconfig)
> > * Then partitioned sdb exactly as sda, partition types: fd
> > * mdadm --create /dev/md[0,1,2] --level=1 --raid-devices=2 /dev/sdb
> > [1,2,4] missing
> > * Created swap on /dev/md1, ext3 on md0 and md2
> > * cp -ax / /mnt/tmp/md0 && cp -ax /var/* /mnt/tmp/md2
> > * added image: kernel boot initrd real_root=/dev/md0 and run silo
> > * modified md0:/etc/fstab to use md-devices
> > * reboot: OK,
> > * change partition type of sda[1,2,4] to fd
> > * mdadm /dev/md[0,1,2] -a /dev/sda[1,2,4]
> > * raid1 arrays rebuild OK
> > * edit /etc/silo.conf and removed original image entry booting
> > from /dev/sda1
> > * rerun silo
> > * reboot: SILO load failed: memory alignment error...
> >
> > Any ideas or experiences?
> >
> > Lieven
>
>
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