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

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

On Thursday 11 October 2007 10:10:42 Gordan Bobic wrote:
> On Thu, 11 Oct 2007, Marc Grimme wrote:
> >> I have iscsi loading and letting me see the relevant shares. I can mount
> >> them. But how do I then remount root to a GFS share on iSCSI?
> >>
> >> I tried:
> >>
> >> mount -t gfs -o lockproto=lock_nolock,remount /dev/sdb2 /
> >
> > Normally the bootimage itself should take over the mounting. You should
> > not bother with it. I don't know if you can easily remout a gfs with
> > changing the lockproto. So as you don't get any errors and it didn't do
> > anything it does not work.
> >
> > But again, normally the initrd mounts the gfs filesystem you specified
> > within you cluster.conf. We didn't test with raw-devices we are always
> > using LVM/CLVM lvs for doing the mount.
>
> I'm not convinced the problem is in the lack of (C)LVM.
Me either and I didn't say so. I just more or less said it is best practice to 
use (C)LVM and yes it is not required. But we don't test without so I don't 
know if it really works although it should.
>
> > 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.
>
> 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.
>
> 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.
>
> > To test it switch on com-step and break where scsi is detected. Setup you
> > iscsi stuff and exit and let the initrd init process do the rest.
> > That should work.
>
> OK. Where is the initrd init script?
linuxrc.generic.sh.

Marc

-- 
Gruss / Regards,

Marc Grimme
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