Re: [Xen-users] Questions on qcow, qcow2 versus LVM

["Fajar A. Nugraha" <fajar@xxxxxxxxx>]

On Thu, Dec 24, 2009 at 9:04 PM, Matthew Law <matt@xxxxxxxxxxxxxxxxxx> wrote:
> I do care about space saving but would trade a little for flexibility and
> performance.

Good to hear that. So at least we can rule out LVM snapshot problems.
At least for now.

>  The dom0 in question has 8 disks on an Adaptec 5805Z
> controller split into a 2 disk RAID1 volume for the OS and a 6 disk RAID6
> volume for domU storage and vm images.  I don't want to use individual
> disks or create scads of partitions for each domU.

I use LVM for domU disks as well. Never had the problem you mentioned.

> I have a bunch of shell scripts to
> provision domUs by creating an LV, formatting it, mounting it and
> untarring the template image into it.

That's basically what I do. I use RHEL 5.4, some with builtin Xen,
others with Gitco's Xen rpm.
You mentioned about disklabels and partitions. Does that mean you use
kpartx? Did you remember to delete the mappings later using "kpartx
-d"?

I seriously suspect your problem is related to kpartx. Try changing
your setup a little bit so that it maps LVs as partition instead of
disks. Something like this on your domU config file:

disk =  [
        'phy:/dev/vg/rootlv,xvda1,w',
        'phy:/dev/vg/swaplv,xvda2,w',
        ]

you could use s/hda1 instead of xvda1, if your existing domU already
use that. There shouldn't be any change necessary to your domU tar
image (including fstab or initramfs) if you don't use LVM on domU side
as well.

After a successful series of lvcreate - mkfs - mount - untar - unmount
- xm create - xm destroy - lvremove, that should at least narrow down
your problem.

-- 
Fajar

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