Re: [Xen-users] Creation of additional image within a domU

["john maclean" <jayeola@xxxxxxxxx>]

Thanks.

`xm block-attach <name> etc etc` worked OK. However 'lomount foo` gave
me a " file too big" error. Over to lvm land. I hear that you can
resize LVM stuff on the fly. Would've been very interesting to see how
it would've turned out though.

On 26/02/07, Mark Williamson <mark.williamson@xxxxxxxxxxxx> wrote:
> > John, sorry I forgot to mention something to you. If you do slice up a
> > virtual block device into partitions, you will need to use one of the
> > quemu tools known as 'lomount' to mount them from dom-0.
>
> This is also shipped with the Xen source distribution because it's so useful.
>
> > You should probably get familiar with it before putting anything serious
> > on the drive.
>
> You can possibly also xm block-attach the VBD into dom0 and then access it.
> *however* I'm not sure this is guaranteed to be safe when using blktap.  It
> might be OK using the loop device based file-VBDs, but I'm not 100%.
>
> > I have also never attempted to fsck a sliced lv or file backed vbd image
> > from dom-0, I'm not quite sure how you would go about doing that if
> > necessary.
>
> The kpartx tools may be useful here, they create device maps from partition
> tables.
>
> Otherwise, you can read out the partition tables using (s)disk, then create
> device maps (or bind /dev/loop devices) yourself to correspond to the
> partitions you're interested in.
>
> So many options :-)  Sorry if it's a bit confusing!
>
> Cheers,
> Mark
>
> > Best,
> > --Tim
> >
> > On Sat, 2007-02-24 at 11:46 +0000, john maclean wrote:
> > > Chaps,
> > >
> > > Perhaps this question is a little basic for this list but I'm not
> > > really sure of the simplest method or best tool for the job.
> > >
> > > I've created some images with `dd=/dev/zero ....` and I'm using them
> > > for the domUs now. Some of them have been running for a few months
> > > with no probs. Trouble is that I'd like to create a separate partition
> > > within the domU. Options:-
> > > 1 - use fdisk? Not sure if that's possible for a file-based image.
> > > Can't run it within the domU
> > > 2 - run dd to create another partiton? Not sure how that would work
> > > 3 - create the new image from scratch and create the new partition as
> > > required and tell /etc/fstab about it.
> >
> > _______________________________________________
> > Xen-users mailing list
> > Xen-users@xxxxxxxxxxxxxxxxxxx
> > http://lists.xensource.com/xen-users
>
> --
> Dave: Just a question. What use is a unicyle with no seat?  And no pedals!
> Mark: To answer a question with a question: What use is a skateboard?
> Dave: Skateboards have wheels.
> Mark: My wheel has a wheel!

--
John Maclean  - 07739 171 531
MSc (DIC)

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