I'm finding a problem that isn't covered by the usual FAQs and online
recipes.
Attempted setup: RAID 10 array with 4 disks.
Because Debian doesn't include RAID10 in its installation disks, I
created a Debian installation on the first partition of sda, in
/dev/sda1. Eventually I'll probably convert it to swap, but in the
meantime that 4G has a complete 2.6.18 install (Debian stable).
I created a RAID 10 array of four partitions, /dev/md/all, out of
/dev/sd[abcd]2.
Using fdisk/cfdisk, I created the partition/dev/md/all1 (500 MB) for
/boot, and the parition /dev/md/all2 with all remaining space into one
large partition (about 850 GB). That larger partition contains /, /usr,
/home, etc. each as a separate LVM volume. I copied usr, var, etc. (but
not proc or sys, of course) files over to the raid array, mounted that
array, did a chroot to its root, and started grub.
I admit that I'm no grub expert, but it's clear that grub cannot "find"
any of the information in /dev/md/all1. For example,
grub> find /boot/grub/this_is_raid
can't find a file that exists only on the raid array. Grub only searches
/dev/sda1, not /dev/md/all1.
Perhaps I'm mistaken but I though it was possible to do boot from
/dev/md/all1.
I've tried other attacks but without success. For example, also while in
chroot,
grub-install /dev/md/all2 does not work. (Nor does it work with the
--root=/boot option.)
I also tried modifications to menu.lst, adding root=/dev/md/all1 to the
kernel command, but RAID array's version of menu.lst is never detected.
What I do see is
grub> find /boot/grub/stage1
(hd0,0)
which indicates (as far as I can tell) that it's found the information
written on /dev/sda1 and nothing in /dev/md/all1.
Am I trying to do something that's basically impossible?
--
Moshe Yudkowsky * moshe@xxxxxxxxx * www.pobox.com/~moshe
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