Re: [OSR-devel] Remounting New Root After Booting

[Marc G. <gr...@at...>]

On Thursday 11 October 2007 11:22:56 Gordan Bobic wrote:
> On Thu, 11 Oct 2007, Marc Grimme wrote:
> >>>>> So when the initrd gets the iscsi disk as scsi-disk all the rest
> >>>>> should be done automatically.
> >>>>
> >>>> Where is the template startup script for the initrd? A few things
> >>>> require a bit of manual intervention, because for some reason iscsid
> >>>> doesn't trigger loading of iscsi_tcp module which is required _before_
> >>>> iscsid loads.
> >>>
> >>> linuxrc.generic.sh is the main init-script.
> >>
> >> Aha! I see now what all the talk about iscsi-lib.sh was. This is what
> >> gets the parameters from the cluster.conf about the root source on iscsi
> >> stuff.
> >>
> >> But what can this do without the iscsi tools being included in the
> >> standard initrd?
> >>
> >> On a separte note, is this "old" iSCSI speciffic (i.e. pre-Open-iSCSI,
> >> as i see mentions of Cisco), or is it just a convenient "dump your iSCSI
> >> initialisation stuff here" script?
> >
> > You can ignore or use anything in iscsi-lib.sh. It is very old. And long
> > ago RHEL3 and I can't remember much of it. As it was only a "study" to
> > prove it works.
>
> Wow! This goes back as far as RHEL3? I'm impressed. :-)
>
> >>>> And, obviously, I'd need to make all this happen before the normal
> >>>> boot process tries to mount the root disk.
> >>>
> >>> Do it before or right after scsi-start is called.
> >>
> >> I can't find any reference to "scsi-start". Where does this happen?
> >
> > It's scsi_start in linux.generic.sh Line 239.
>
> D'oh! What a difference an _ makes.
>
> I think the iSCSI stuff should be added before the dm_start stuff, which
> is just before the scsi_start.
>
> Right, that seems to have worked. Almost there. Now I get:
>
> Mounting LABEL=/ on /mnt/newroot..device not found error [FAILED]
> Mounting /cdsl.local on /cluster/cdsl/3..no cdsldir found
> "/mnt/mewroot//cluster/cdsl"
> Could not mount cdsl /cdsl.local to /cluster/cdsl/3. Exiting
>
> Where does it get the LABEL=/ from? I'm pretty sure I didn't set any.
>
> >>>> Or will specifying the iscsi stuff in cluster.conf make all this work?
> >>>> Given that the iscsi components weren't in the standard initrd, I'm
> >>>> not too convinced this will work (although there's a distinct
> >>>> possibility that this is totally unrelated and irrelevant in this
> >>>> case).
> >>>
> >>> Yes I agree. Make it work for you and we'll integrate it so it'll only
> >>> be called if iscsi is selected.
> >>
> >> LOL! I must say I'm not used to getting integrated into the development
> >> effort this quickly. Not that I don't mind. :-)
> >
> > We'll integrate it in preview and tag it as experimental. But as iscsi
> > integration is on our list but only in next major version we are happy to
> > use anything that is provided by others.
>
> It surprises me that the whole concept didn't start with iSCSI. How else
> can you provide a shared GFS root for a cluster? NBDs? Shared SCSI bus (2
> controllers in 2 machines with the drives shared on the chain)?
>
> Gordan
>
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Concerning LABEL=/
I think you should check you bootloader config and change root=LABEL=/ to 
root=/dev/sd.. That should do it.

-- 
Gruss / Regards,

Marc Grimme
Phone: +49-89 452 3538-14
http://www.atix.de/               http://www.open-sharedroot.org/

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