SLES installation on dual controller subsystem

SLES installation on dual controller subsystem

[Pradipmaya Maharana]

Hi All,

I am trying to install SLES 10.1 on my dual controller subsystem. The
subsystem is ALUA aware and hence shows me 2 LUNs for one while trying
to install SLES on it.

If my LUN's preferred controller is 1 then everything goes fine, but
if the preferred controller of the LUN I am installing OS on is 2,
then installation goes fine but the boot fails.

It throws some errors like root (hd1,1) could not found. When I modify
this to too(hd0,1) it boots fine.

What am I missing here?

Regards,
Pradipmaya.

Re: SLES installation on dual controller subsystem

[malahal]

Pradipmaya Maharana [pradipmaya@gmail.com] wrote:
> Hi All,
> 
> I am trying to install SLES 10.1 on my dual controller subsystem. The
> subsystem is ALUA aware and hence shows me 2 LUNs for one while trying
> to install SLES on it.
> 
> If my LUN's preferred controller is 1 then everything goes fine, but
> if the preferred controller of the LUN I am installing OS on is 2,
> then installation goes fine but the boot fails.
> 
> It throws some errors like root (hd1,1) could not found. When I modify
> this to too(hd0,1) it boots fine.

Looks like a GRUB issue to me. Go into grub's interactive/editing mode
while booting and try "root (hd<TAB>), it will tell you what partitions
it sees. My guess is that GRUB can't find your other path and that is
why it can't see (hd1,1). (hd0,1) works because it saw that path.

If that is indeed right, it is a BIOS feature/problem.

-Malahal.

Re: SLES installation on dual controller subsystem

[Chandra Seetharaman]

On Mon, 2008-02-04 at 15:58 -0800, Pradipmaya Maharana wrote:
> Hi All,
> 
> I am trying to install SLES 10.1 on my dual controller subsystem. The
> subsystem is ALUA aware and hence shows me 2 LUNs for one while trying
> to install SLES on it.
> 
> If my LUN's preferred controller is 1 then everything goes fine, but
> if the preferred controller of the LUN I am installing OS on is 2,
> then installation goes fine but the boot fails.
> 
> It throws some errors like root (hd1,1) could not found. When I modify
> this to too(hd0,1) it boots fine.
> 
> What am I missing here?

From what you explain, looks like the kernel doesn't boot at all. You
are getting error from your BIOS/firmware.

Your BIOS/firmware may not be multipath aware.
 
> 
> Regards,
> Pradipmaya.
> 
> --
> dm-devel mailing list
> dm-devel@redhat.com
> https://www.redhat.com/mailman/listinfo/dm-devel
-- 

----------------------------------------------------------------------
    Chandra Seetharaman               | Be careful what you choose....
              - sekharan@us.ibm.com   |      .......you may get it.
----------------------------------------------------------------------

Re: SLES installation on dual controller subsystem

[Pradipmaya Maharana]

Thanks for your response.
RHEL works fine in same scenario; any explanation why? I mean what
does RHEL do different here?

Thanks and Regards,
Pradipmaya.


On Feb 4, 2008 6:10 PM, Chandra Seetharaman <sekharan@us.ibm.com> wrote:
>
> On Mon, 2008-02-04 at 15:58 -0800, Pradipmaya Maharana wrote:
> > Hi All,
> >
> > I am trying to install SLES 10.1 on my dual controller subsystem. The
> > subsystem is ALUA aware and hence shows me 2 LUNs for one while trying
> > to install SLES on it.
> >
> > If my LUN's preferred controller is 1 then everything goes fine, but
> > if the preferred controller of the LUN I am installing OS on is 2,
> > then installation goes fine but the boot fails.
> >
> > It throws some errors like root (hd1,1) could not found. When I modify
> > this to too(hd0,1) it boots fine.
> >
> > What am I missing here?
>
> >From what you explain, looks like the kernel doesn't boot at all. You
> are getting error from your BIOS/firmware.
>
> Your BIOS/firmware may not be multipath aware.
>
> >
> > Regards,
> > Pradipmaya.
> >
> > --
> > dm-devel mailing list
> > dm-devel@redhat.com
> > https://www.redhat.com/mailman/listinfo/dm-devel
> --
>
> ----------------------------------------------------------------------
>    Chandra Seetharaman               | Be careful what you choose....
>              - sekharan@us.ibm.com   |      .......you may get it.
> ----------------------------------------------------------------------
>
>
>
> --
> dm-devel mailing list
> dm-devel@redhat.com
> https://www.redhat.com/mailman/listinfo/dm-devel
>

Re: SLES installation on dual controller subsystem

[malahal]

Pradipmaya Maharana [pradipmaya@gmail.com] wrote:
> Thanks for your response.
> RHEL works fine in same scenario; any explanation why? I mean what
> does RHEL do different here?

What does RHEL set its root? "root (hd0,1)" or "root (hd1,1)"?