Sun Fire[TM] V60x/V65x grub configuration problems on RAIDed /boot

Asset ID:	1-72-1012033.1
Update Date:	2012-07-30
Keywords:

Solution Type Problem Resolution Sure

Solution 1012033.1 : Sun Fire[TM] V60x/V65x grub configuration problems on RAIDed /boot

Applies to:

Sun Fire V60x Server - Version Not Applicable and later
Sun Fire V65x Server - Version Not Applicable and later
All Platforms
***Checked for relevance on 17-May-2012***

Symptoms

Unable to boot to mirror disk after Linux install

Changes

Moving from a single disk installation to a mirror or new install directly to a mirror

Cause

When installing Red Hat(R) Linux, GRUB (Grand Unified Bootloader) does not write to the Master Boot Record (MBR) of both mirror disks

Solution

Resolution

Assumptions:
1) GRUB is already installed and the systems boots with both drives using the installed GRUB boot manager
2) /boot is installed in a RAID 1 metadevice
Reconfigure GRUB so that it does write to the Master Boot Record of your RAIDed boot:
   # grub

   grub> root (hd0,0)
   Filesystem type is ext3fs, partition type 0xfd
   grub> setup (hd0)
   Checking if "/boot/grub/stage1" exists... yes
   Checking if "/boot/grub/stage2" exists... yes
   Checking if "/boot/grub/e2fs_stage1_5" exists... yes
   Running "embed /boot/grub/e2fs_stage1_5 (hd0)"...  16 sectors are embedded. succeeded
   Running "install /boot/grub/stage1 (hd0) (hd0)1+16 p (hd0,0)/boot/grub/stage2 /boot/grub/grub.conf"... succeeded
   Done.

   grub> root (hd1,0)
   Filesystem type is ext2fs, partition type 0xfd
   grub> setup (hd1)
   Checking if "/boot/grub/stage1" exists... yes
   Checking if "/boot/grub/stage2" exists... yes
   Checking if "/boot/grub/e2fs_stage1_5" exists... yes
   Running "embed /boot/grub/e2fs_stage1_5 (hd1)"...  16 sectors are embedded. succeeded
   Running "install /boot/grub/stage1 (hd1) (hd1)1+16 p (hd1,0)/boot/grub/stage2 /boot/grub/grub.conf"... succeeded
   Done.

   grub> quit
------------------------------------------------------------------
Here is how /boot/grub/grub.conf is: (/dev/md0 mounted as /boot)
(Assuming kernel is installed as /boot/bzImage, and RAID1 support
compiled into the kernel).
------------------------------------------------------------------
# Boot automatically after 30 secs.
timeout 30
# By default, boot the first entry.
default 0
# Fallback to the second entry.
fallback 1
# For booting with disc 0 kernel
title  GNU/Linux (hd0,0)
kernel (hd0,0)/bzImage root=/dev/md1
# For booting with disc 1 kernel, if (hd0,0)/bzImage is unreadable
title  GNU/Linux (hd1,0)
kernel (hd1,0)/bzImage root=/dev/md1

@ Previously Published As 71976

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