RE: [Xen-users] Mounting RHEL 4 virtual machine disks (dd/mount -oloop)

["Luke S. Crawford" <lsc@xxxxxxxxx>]

On Tue, 17 Apr 2007, Kraska, Joe A (US SSA) wrote:
> Mkay. Maybe it wasn't obvious but "hda" in the above mount command is
> the
> Xen image file. It was the file made with dd, into which RHEL44 was
> installed
> using Qemu. I'm a bit confused in your instructions, because you seem to
> be
> forwarding me to a /dev/hda, and don't reference my file based image at
> all.
> That I can see.
Ahh.  my mistake then.

it's

losetup /dev/loop1 /path/to/file

now /dev/loop1 (you may need to increment or decrement the 1 to get a 
free loop device)  is a device in the Dom0 that looks a lot like how the 
DomU would see /dev/hda.
so now you go from /dev/loop1  to the sub-partitions.
kpartx -av /dev/loop1
would be how you would do it if it were straight partitions.

with lvm, you need to vgscan it, but from what I understand, vgscan scans 
all devices, including or excluding certain devices in the lvm config 
files.  (on my system, /etc/lvm/lvm.conf specifies a filter= that excludes 
the cdrom device)     You need to somehow get vgscan to read /dev/loop1.
(it is possible that just 'vgscan' or 'lvscan' after you do the losetup 
will do the job.)
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