[CentOS] Re: Stuck at GRUB

Christopher Chan christopher at ias.com.hk
Thu Nov 29 14:48:47 UTC 2007

Ugo Bellavance wrote:
> jancio_wodnik at wp.pl wrote:
>> Christopher Chan pisze:
>>>>>>> grub cannot find its second stage. Are you booting from a 
>>>>>>> mirrored partition?
>>>>>> Yes
>>>>> What could be a solution?  And what could have happen upon the reboot?
>>>> That is weird.  I just re-installed centos5 and it is now booting 
>>>> properly.  What could I do to avoid this situation in the future?
>>> IIRC, RHEL4 does not properly handle installation of grub on mirrored 
>>> partitions and therefore Centos4 suffers from the same problem.
>>> RHEL5 does it properly now as you can see. This has been a long 
>>> outstanding problem of anaconda.
>> Yeap, this is true. After installing centos4 on RAID1 disk (software 
>> raid) i always do:
>> grub
>> grub>device (hd0) /dev/hdc
>> grub>root (hd0,0)       grub>setup (hd0)
>> where /dev/hdc is second RAID DISK (it could be whatever: /dev/sdb1 etc)
> Ok, on one system I had /boot as /dev/md0, and md0 is composed of 
> /dev/hda1 and /dev/hdb1.
> I have done:
> grub> device (hd0) /dev/hdb
> grub> root (hd0,0)
>  Filesystem type is ext2fs, partition type 0xfd
> grub> setup (hd0)
>  Checking if "/boot/grub/stage1" exists... no
>  Checking if "/grub/stage1" exists... yes
>  Checking if "/grub/stage2" exists... yes
>  Checking if "/grub/e2fs_stage1_5" exists... yes
>  Running "embed /grub/e2fs_stage1_5 (hd0)"...  16 sectors are embedded.
> succeeded
>  Running "install /grub/stage1 (hd0) (hd0)1+16 p (hd0,0)/grub/stage2 
> /grub/grub
> .conf"... succeeded
> Done.
> Am I in the right way?

Looks good. The important part is that it references the drive when 
doing the installation.

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