Re: Removing one drive from a RAID 1 setup?

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On Wed, 2009-08-26 at 03:12 -0500, Bruno Wolff III wrote:

> >
> > Why would it mess up grub? - I thought I would just need to edit  
> > /etc/fstab . .
> 
> Because grub might not be saved on both MBRs. Because removing one disk
> might rename the other and depending on how you have grub pointing to
> the conf file this could break as well (though is less likely).
> Grub doesn't actually see the raid array, it uses the filesystem in
> read only mode (which works because the raid info is at the end of the
> partition). So there can be issues with pulling drives out of the array.
> 

I ran into this issue when one of my disks in a RAID 1 mirror died
unexpectedly.  GRUB wasn't installed on the MBR of both drives so the PC
wouldn't boot.  I also had the issue where the drives were renamed
(/dev/sda died)

Fortunately, I found Super Grub Disk (http://www.supergrubdisk.org/)
which came to my rescue.  It correctly read the renamed disk, installed
GRUB, and resolved the issue.  

Law

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