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[linux-lvm] lvm partition on lv



Warning:  This may be insane.

I like the flexibility of LVM and try to use it wherever it's feasible. In this case, I'd like a Xen guest OS to have control over it's LV's. The method I usually see for using LVM with Xen is to create an LV and a filesystem on it. I would like to instead create an LV and partition it with an LVM partition and maybe other partition types. Just to test this I did the following:

1. lvcreate -L 100M -name test vg1
2. cfdisk /dev/vg1/test
3. create LVM partition on entire device
4. pvcreate /dev/vg1/test
5. vgcreate vg2 /dev/vg1/test
6. vgchange -ay /dev/vg2
7. lvcreate -L 50M -n testlv vg2
8. mkfs.ext3 /dev/vg2/testlv
9. mkdir /mnt/test
10. mount /dev/vg2/testlv /mnt/test

And it worked!  Cool!

Let's say on /dev/vg1/test I had one LVM partition and one ext3 partition. How can I access those separate partitions since it's only one device (/dev/vg1/test)? Normally, a partitioned block device (/dev/hda) would show up like /dev/hda1, dev/hda2, etc.

In the example above, I'm partitioning the LV and using the partition on the same system, which is useless. What I will be doing is giving the disk image /dev/vg1/test to a Xen guest so it can have it's own VG and LVs. Are there potential problems I should look out for and/or tweaking I should do to make this work optimally?

Randall


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