[CentOS] Re: Stuck at GRUB

Ugo Bellavance ugob at lubik.ca
Thu Nov 29 15:10:08 UTC 2007

Christopher Chan wrote:
> 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.

What do you mean?

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