[Tfug] Repairing grub after array rebuild

[Timothy D. Lenz]

Got the warranty replacement drive installed and got the 3 mirror arrays 
restored. But the last step I had in my notes to make the drive bootable 
didn't seem to work. I build raid into the kernel so it can boot right 
from ether drive if the other fails. My notes from an IRC chat:

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[14:02] <Jordan_U> Vorg: No. First, what is the output of grub-install 
--version?
[14:02] <Vorg>  (GNU GRUB 1.98~20100115-1)
[14:04] <Jordan_U> Vorg: Ok, then run "grub-install /dev/sda && 
grub-install /dev/sdb" (where sda and sdb are the members of the array)
[14:05] <Vorg> I haven't added sdb to the array yet, ok, to do this 
before adding it in?
[14:06] <Vorg> sda is the current remaining drive from the array and sdb 
is the new one. Just don't want to screw up the old one and have nothing 
working
[14:06] <Jordan_U> Vorg: You should add sdb to the array first.
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I have done this before, but this time I got some kind of error:

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vorg at x64VDR:~$ su
Password:
x64VDR:/home/vorg# grub-install /dev/sda && grub-install /dev/sdb
/usr/sbin/grub-probe: error: no such disk.
Auto-detection of a filesystem of /dev/md0 failed.
Please report this together with the output of "/usr/sbin/grub-probe 
--device-map=/boot/grub/devi             ce.map --target=fs -v 
/boot/grub" to <bug-grub at gnu.org>
x64VDR:/home/vorg# exit
exit
vorg at x64VDR:~$
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  The drive replaced is sda.