BOOT from MD by GRUB

• RAID1を/dev/hda,/dev/hdcで実現している
• bootディレクトリを1つめのパーティションに追いている

device (hd0) /dev/hda
root (hd0,0)
install /boot/grub/stage1 (hd0,0) /boot/grub/stage2 0x8000 (hd0,0)/boot/grub/menu.lst
install /boot/grub/stage1 d (hd0) /boot/grub/stage2 0x8000 (hd0,0)/boot/grub/menu.lst

device (hd0) /dev/hdc
root (hd0,0)
install /boot/grub/stage1 (hd0,0) /boot/grub/stage2 0x8000 (hd0,0)/boot/grub/menu.lst
install /boot/grub/stage1 d (hd0) /boot/grub/stage2 0x8000 (hd0,0)/boot/grub/menu.lst

quit

grub --batch < raid1-boot.grub

• device (hd0) /dev/hd？
  /dev/hd？をhd0に指定
• root (hd0,0)
  hd0の1つめのパーティションをrootに指定
• install /boot/grub/stage1 (hd0,0) /boot/grub/stage2 0x8000 (hd0,0)/boot/grub/menu.lst
  stage1を(hd0,0)にインストールし、 stage2からブロックリストをインストールします。 stage2は0x8000にロードされます。 menu.lstを指定して、STAGE2の最初のブロックにはブート時に パーティションと設定ファイルの名前が使われるようにします。
• install /boot/grub/stage1 d (hd0) /boot/grub/stage2 0x8000 (hd0,0)/boot/grub/menu.lst
  stage1を(hd0)のMBRにインストールし、 stage2からブロックリストをインストールします。 stage2は0x8000にロードされます。 stage1はstage2から見える位置にインストールされます('d'指定)。 menu.lstを指定して、STAGE2の最初のブロックにはブート時に パーティションと設定ファイルの名前が使われるようにします。

grub> help device
device: device DRIVE DEVICE
    Specify DEVICE as the actual drive for a BIOS drive DRIVE. This
    command can be used only in the grub shell.

grub> help root
root: root [DEVICE [HDBIAS]]
    Set the current "root device" to the device DEVICE, then attempt
    to mount it to get the partition size (for passing the partition
    descriptor in `ES:ESI', used by some chain-loaded bootloaders),
    the BSD drive-type (for booting BSD kernels using their native
    boot format), and correctly determine  the PC partition where a
    BSD sub-partition is located. The optional HDBIAS parameter is a
    number to tell a BSD kernel how many BIOS drive numbers are on
    controllers before the current one. For example, if there is an
    IDE disk and a SCSI disk, and your FreeBSD root partition is on
    the SCSI disk, then use a `1' for HDBIAS.
rootnoverify: rootnoverify [DEVICE [HDBIAS]]
    Similar to `root', but don't attempt to mount the partition. This
    is useful for when an OS is outside of the area of the disk that
    GRUB can read, but setting the correct root device is still
    desired. Note that the items mentioned in `root' which derived
    from attempting the mount will NOT work correctly.

grub> help install
install: install [--stage2=STAGE2_FILE] [--force-lba] STAGE1 [d] DEVICE STAGE2
[ADDR] [p] [CONFIG_FILE] [REAL_CONFIG_FILE]
    Install STAGE1 on DEVICE, and install a blocklist for loading
    STAGE2 as a Stage 2. If the option `d' is present, the Stage 1
    will always look for the disk where STAGE2 was installed, rather
    than using the booting drive. The Stage 2 will be loaded at
    address ADDR, which will be determined automatically if you don't
    specify it. If the option `p' or CONFIG_FILE is present, then the
    first block of Stage 2 is patched with new values of the
    partition and name of the configuration file used by the true
    Stage 2 (for a Stage 1.5, this is the name of the true Stage 2)
    at boot time. If STAGE2 is a Stage 1.5 and REAL_CONFIG_FILE is
    present, then the Stage 2 CONFIG_FILE is patched with the
    configuration filename REAL_CONFIG_FILE. If the option
    `--force-lba' is specified, disable some sanity checks for LBA
    mode. If the option `--stage2' is specified, rewrite the Stage 2
    via your OS's filesystem instead of the raw device.