[dm-devel] Configuring multipath for root device

[Romanowski, John (OFT)]

I'm very new to sles 10; sounds like you want to do root-on-LVM-on-multipath 
I don't know if sles10 supports that.

Maybe 2 things to try: 
(1) if /dev/rootVG/rootLV has a /dev/disk/by-id/ link then use that persistent name along with putting dm-multipath in INITRD modules list; then run mkinitrd and zipl

(2) Or, use the LVM persistent name, /dev/rootVG/rootLV, instead of a /dev/disk/by-id/ name

good luck.


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-----Original Message-----

From: dm-devel-bounces at redhat.com on behalf of Chandra Seetharaman
Sent: Tue 1/15/2008 9:32 PM
To: device-mapper development
Subject: Re: [dm-devel] Configuring multipath for root device
 
On Tue, 2008-01-15 at 18:25 -0800, Pradipmaya Maharana wrote:
> Hi All,
> 
> Thanks for all your comments, it worked for installaions on partitions.

Cool.
> 
> Now the question is:
> Is it supposed to work the same way if the SLES is installed on LVM?

Supposed to :)

> On SLES, under fstab, I do not see any device, except for the boot
> device; other entries does not have /dev/deisk mention. In such

I am not clear about what you are mentioning here. Can you annotate with
a cut-n-paste of /etc/fstab ?

> scenario, how am I supposed to make the /root device multipath-aware?
> 
> I tried the same with RHEL, but with RHEL installed (with linux mpath)
> on LVM, it seems to be working fine. Is there anything I am missing on
> SLES?
> 
> Thanks and Regards,
> Pradipmaya.
> 
> 
> 
> On Jan 7, 2008 11:17 PM, Hannes Reinecke <hare at suse.de> wrote:
> > Pradipmaya Maharana wrote:
> > > RHEL Steps worked perfectly for me but i have a question for SLES installation.
> > >
> > > Question. While installing SLES on multipath devices, the second step says:
> > >
> > > " 2. Complete the installation. Let the system boot up in multiuser mode.
> > > Make sure the root device, swap device are all referenced by their by-id
> > > device node entries instead of /dev/sd* type names. If they are not, fix
> > > them first."
> > >
> > > How do you check that root device and swap device are referenced by their by-id?
> > > And if it is not referenced by the by-id, how do I fix it? Re-install?
> > >
> > Check /etc/fstab. Those devices should be listed as /dev/disk/by-id/XXX.
> > If not (ie if their names are /dev/sdXX) look for the appropriate symlink
> > in /dev/disk/by-id and edit /etc/fstab.
> >
> > Cheers,
> >
> > Hannes
> > --
> > Dr. Hannes Reinecke                   zSeries & Storage
> > hare at suse.de                          +49 911 74053 688
> > SUSE LINUX Products GmbH, Maxfeldstr. 5, 90409 Nürnberg
> > GF: Markus Rex, HRB 16746 (AG Nürnberg)
> >
> > --
> >
> > dm-devel mailing list
> > dm-devel at redhat.com
> > https://www.redhat.com/mailman/listinfo/dm-devel
> >
> 
> --
> dm-devel mailing list
> dm-devel at redhat.com
> https://www.redhat.com/mailman/listinfo/dm-devel
-- 

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


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