[CentOS] boot problem after disk change on raid1

Thu Sep 8 04:22:32 UTC 2011
Bünyamin İzzet <bunyamin.izzet at gmail.com>

On Wed, Sep 7, 2011 at 11:38 PM, Devin Reade <gdr at gno.org> wrote:

> --On Wednesday, September 07, 2011 08:22:47 PM +0300 Bünyamin İzzet
> <bunyamin.izzet at gmail.com> wrote:
>
>        - made sure we have boot blocks on both disks, based on information
>          at http://grub.enbug.org/MirroringRAID
>                modified /boot/grub/device.map from:
>                         (hd0)     /dev/sda
>                        (hd1)     /dev/sdb
>                 to:
>                        (hd0)     /dev/sda
>                        (hd0)     /dev/sdb
>
I have changed the device.map as you said


>                and then:
>                        # grub
>                        grub> device (hd0) /dev/sdb
>                        grub> root (hd0,0)
>                        grub> setup (hd0)
>                        grub> quit
>
> And, it is done too.


It still does not boot. I could not see the error message, because it is a
dedicated server and I am not sitting at the monitor of the server. So I
type the lines in grub.conf manually to see the error (I'm not sure if it is
the right thing to see the error).


# grub
Probing devices to guess BIOS drives. This may take a long time.


    GNU GRUB  version 0.97  (640K lower / 3072K upper memory)

 [ Minimal BASH-like line editing is supported.  For the first word, TAB
   lists possible command completions.  Anywhere else TAB lists the possible
   completions of a device/filename.]
grub> root (hd1,0)
root (hd1,0)
 Filesystem type is ext2fs, partition type 0xfd
grub> kernel /vmlinuz-2.6.18-238.19.1.el5 ro root=/dev/md1 vga=0x317
kernel /vmlinuz-2.6.18-238.19.1.el5 ro root=/dev/md1 vga=0x317
   [Linux-bzImage, setup=0x1e00, size=0x1fe01c]
grub> initrd /initrd-2.6.18-238.19.1.el5.img
initrd /initrd-2.6.18-238.19.1.el5.img

Error 28: Selected item cannot fit into memory
grub> quit
quit


If it is not the right thing to see the error message at boot time, is there
any chance to log grub errors, boot errors?

Thanks,
Bunyamin.
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