Jordi Prats wrote:
Hi all,
How can I define voluem groups and logical volumes using a disk image on
a file that will be the root filesystem of another machine (not the one
that is defining them)?
The link below provides some details which may help. You can use losetup
to associate a loop device with a regular file, then treat it as you
would to a normal block device.
http://fedoraproject.org/wiki/Docs/Fedora7VirtQuickStart#head-498c8bbe74fd334cf63a4f1f918be74c726238dd
ie:
# create a sparse file to use as the block device in the guest
dd if=/dev/zero of=disk1.img seek=8096 bs=1M count=0
# setup a loopback device
losetup /dev/loop0 disk1.img
/dev/loop0 can now be used like a normal block device. If you partition
the device thou it's slightly different - you need to use kpartx to make
the partitions usable.
ie:
# create a partition table on the device (/boot cannot be on an LVM volume)
fdisk /dev/loop0
# make the partitions visible (they will appear as /dev/mapper/loop0pX,
where X is a partition number)
kpartx -a /dev/loop0
# then you can use LVM on the devices
pvcreate /dev/mapper/loop0p1
The LVM's point of view there is nothing special that needs to be done
other than scanning for the volume groups (vgscan) and
activating/deactivating them (vgchange -ay <vg>/ vgchange -an <vg>).
Dave
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