[CALUG] Hardware Mirroring

Eric V. Smith eric at trueblade.com
Sat Oct 15 15:43:26 CDT 2005

Rajiv Gunja wrote:
> Does anyone in the group used hardware mirroring?, if so, have you installed
> grub on both boot disks ?
> Explanation of my Question:
> I recently obtained a Dell server which lets me do hardware mirroring on its
> internal drive using megaraid. I intend to install either RHEL 4 or SLES 9.
> For redundency, I mirrored the boot disks via hardware mirroring. Now I can
> install grub on the first disk, but not on the second disk. The basic
> thought being that if the first disk goes bad, the second disk should be
> bootable. Every time I try to install grub on it, it fails -> core dump. So
> the only way I can boot through the second disk is via a floppy drive, which
> is kind of annoying, as i have to make sure that the floppy disk is not
> currupted.
> I have looked at RH website and there is no solution for hardware mirror,
> however they have solution for the same for a software mirroring.

This won't help you, but I've been looking at the same problem with 
software RAID.  I haven't been able to find anything on the RH site.  Do 
you have the link you mentioned that explains the software RAID solution 
for this?


On your question, I agree with David.  If it's real hardware RAID, the 
operating system isn't aware of what's going on and will only see a 
single disk.  Any solution will need to come from the RAID controller.


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