[CALUG] Hardware Mirroring

Rajiv Gunja opn.src.rocks at gmail.com
Sat Oct 15 22:20:51 CDT 2005

David / Eric,

So, if I pulled out the first or the second drive from the hardware
mirroring, the system should boot up without a hitch. I need to test this
Yup, I had to do the mirroring via the bootup, just after the splash screen.
Thats the only way it is accessible. If you are wondering, the server is
Dell 6850 (8x12). I also got an IBM eServer to play with. Have to test these
configs out.

Unfortunately, I am unable to find that link which talked about breaking a
software mirror and installing grub on the second disk. Seems like RH
changed their knowledge base search or I am not giving the same search
values as I gave last month.

Thanks guys


Rajiv G Gunja
System Analyst / Engg
SUN / AIX / HPUX / Linux Admin
IM: AOL / Yahoo / MSN : ggvrsn

On 10/15/05, Eric V. Smith <eric at trueblade.com> wrote:
> 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?
> Thanks.
> 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.
> Eric.
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