Re: Replacing failed software RAID drive

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Hugh E Cruickshank wrote:
From: Les Mikesell Sent: October 7, 2007 18:53
OK, you just have to replace the drive, fdisk matching partitions on it ("fdisk -l /dev/sde" will show the sizes you need), then use
mdadm --add /dev/md? /dev/sda?
for each one to add the missing partition back.

I have been able to review all this and it looks very straight forward.

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.

--
  Les Mikesell
   lesmikesell@xxxxxxxxx
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