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

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

On Thu, Dec 24, 2009 at 11:56 PM, Matthew Law <matt@xxxxxxxxxxxxxxxxxx> wrote:
> # domU backing store
> lvcreate -C y -L 10G -n myvm VolGroupVM
> parted /dev/VolGroupVM/myvm mklabel msdos
> parted /dev/VolGroupVM/myvm mkpartfs primary ext2 0 1024000
> kpartx -p "" -av /dev/VolGroupVM/myvm
> tune2fs -j /dev/mapper/myvm1
> kpartx -d /dev/VolGroupVM/myvm

hmm ... kpartx -d part looks OK. I use something like

lvcreate
mkfs.ext3

no parted/kpartx involved, since the filesystem and swap is directly on the LV

>
> # domU swap
> lvcreate -C y -L 512 -n myvm-swap VolGroupVM
> parted /dev/VolGroupVM/myvm-swap mklabel msdos
> parted /dev/VolGroupVM/myvm-swap mkpartfs primary linux-swap 0 512
> mkswap /dev/mapper/VolGroupVM-myvm--swapp1
> lvscan | sort | grep ${NAME}

what, no "kpartx" here? Not even "kpartx -a"? How did you get
/dev/mapper/VolGroupVM-myvm--swapp1, was it automatically created by
parted without the need to manually run kpartx?

> Then it is basically a case of (from memory):
>
> mount -t ext3 /dev/mapper/myvm1 /mnt/vminstall
> tar -xzf /home/vmimages/image.tar.gz -C /mnt/vminstall
> umount /mnt/vminstall

looks good.

> I have cobbled together these commands based on what I have read at
> various places.  Have I screwed up somewhere?

I'd say the biggest difference from my setup is that you use
partitions with parted and kpartx. I haven't tested that, but it might
be your source of problem. Try partionless setup that I mentioned
earier to narrow down the source of problem.

-- 
Fajar

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