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Got it.

Could Cinder can check the created volume? I can not find any command
like cinder
update. I try to extends the volume by lvextend, but data in the cinder db
doesn't update. So when I delete the changed volume, it raise error.

On Tue, Nov 27, 2012 at 12:34 PM, Dean Troyer <dtroyer at gmail.com> wrote:

On Mon, Nov 26, 2012 at 8:04 PM, Lei Zhang <zhang.lei.fly at gmail.com> wrote:
> > Another question. If the vm treat the vol-0 as a normal block device, is
> it
> > necessary to partition? If not, the fdisk will show Disk /dev/vdb doesn't
> > contain a valid partition table. If yes, how can I extend the volume on
> the
> > vm? It seems that treat the volume as a normal block device is not a good
> > idea.
>
> It is not necessary to partition the device (vdb) inside com-0.  If
> you use it as an LVM physical device (PV) inside com-0 then pvresize
> will update the metadata o recognize the new size inside com-0 after
> you lvextend the vol-0 in the host.
>
> If you do partition /dev/vdb and don't use LVM in com-0 it is still
> possible to grow a partition, but you'll have to delete and re-create
> the last partition to get com-0 to recognize the additional space.
> And you'd also need to do the filesystem resize too.
>
> Nested LVM can be tricky but if you are careful to keep the layers
> separated it can work.
>
> dt
>
> --
>
> Dean Troyer
> dtroyer at gmail.com
>
-- 
Lei Zhang

Blog: http://jeffrey4l.github.com
twitter/weibo: @jeffrey4l
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