Hello,
I successfully set up an Intel Matrix Raid device with a RAID1 and a RAID0
volume, each having a couple of partitions, but then I could not install GRUB2
on the RAID1 volume, which I wanted to use to boot from and mount as root. It
turned out that the "IMSM" metadata is not supported in GRUB2 (v1.97.1) just
yet, so I had to turn away from my original plan.
To "imitate" the setup I originally wanded, I turned both of my drives into
AHCI controlled devices in the BIOS (instead of RAID), and I partitioned them
to obtain /dev/sda[12] and /dev/sdb[12].
Then I used /dev/sd[ab]1 to build a RAID1 set, and /dev/sd[ab]2 to create a
RAID0 set using mdadm v 3.0.3:
> mdadm -C /dev/md0 -v -e 0 -l 1 -n 2 /dev/sda1 /dev/sdb1
> mdadm -C /dev/md1 -v -e 0 -l 0 -n 2 /dev/sda2 /dev/sdb2
I set the metadata type to 0.90 because I would like to boot from it and allow
the kernel to auto-detect the RAID devices while it's booting, in order to can
get away from using an intitrd (I am building my own distribution based on CLFS
x86_64 multilib).
I used cfdisk to partition both of the /dev/md[01] devices, and I obtained
/dev/md0p[123] and /dev/md1p[12]. The plan is to use /dev/md0p1 as a RAID1 root
partition, and have the system boot from /dev/md0. I formatted /dev/md0p1 as
> mk2efs -t ext4 -L OS /dev/md0p1
To this point, things went smoothly. mdadm -D... and mdadm -E... did report
back working devices as intended. Then mounted /dev/md0p1 on a directory called
/root/os, and I did
> grub-install --root-directory=/root/os /dev/md0
or
> grub-install --root-directory=/root/os "md0"
and I got a warning and an error message: "Embedding area is too small for
core.img." and "Embedding is not possible, but this is required when the root
device is on a RAID array or LVM volume."
What did I do wrong, and how do I fix it? Thanks ahead,
Tibor
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