[CentOS] Replacing failed software RAID drive
Hugh E Cruickshank
hugh at forsoft.com
Wed Oct 10 23:47:34 UTC 2007
From: Les Mikesell Sent: October 10, 2007 16:37
> Hugh E Cruickshank wrote:
> > From: Les Mikesell
> >> Hugh E Cruickshank wrote:
> >>> From: Les Mikesell Sent: October 7, 2007 18:53
> >>>> Then reinstall grub on the drive.
> >>> Now I have some questions:
> >>> 1. Since the /boot partition was mirrored and will be restored on the
> >>> new sda drive I do not really want to do a full grub install. From
> >>> what I have read that will overwrite existing /boot/grub/grub.conf
> >>> file. So I just want to write the MBR on the drive. How to I do
> >>> that (the docs I have found were rather unclear on that aspect)?
> >>> 2. Can a install grub on the replaced boot drive with the system still
> >>> running?
> >> Yes, after the /boot partition re-sync has completed, execute grub and:
> >> root (hd0,0)
> >> setup (hd0)
> >> quit
> >> If you aren't able to keep the system running while doing the swap, you
> >> can also do this from the rescue mode boot, but you should have the
> >> contents on the /boot partition first.
> > Sorry to be obtuse here but I just want to make very sure of what I am
> > doing before I do it. Will the "setup" command only write the MBR?
> Yes, it will verify that the root partition (grub calls /boot root since
> that's all it knows about) looks right, then write the MBR.
Bless you Les. That is just what I was hoping for. Thanks again for all
your (and everyone else's) help on this, it has been greatly appreciated.
Hugh E Cruickshank, Forward Software, www.forward-software.com
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