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other hazard to mention.

live fs resizes tend to be sketchy.  the growing of a live filesystem is
possible and tends to work.  but shrinking for obvious reasons is very
dangerous and can be wrought with peril.  also cannot be done live as far
as I know for any ext filesystem.

-matt

On Tue, Nov 27, 2012 at 6:13 PM, Lei Zhang <zhang.lei.fly at gmail.com> wrote:

> 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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