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Embedding area too small... (GRUB2 on software RAID1)

From: Lapohos Tibor
Subject: Embedding area too small... (GRUB2 on software RAID1)
Date: Tue, 5 Jan 2010 10:37:46 -0800 (PST)



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


> 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,


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