[openstack-dev] [Nova] Support specified volume_type when boot instance, do we like it?

Andrew Laski andrew at lascii.com
Mon Aug 29 13:29:57 UTC 2016

On Mon, Aug 29, 2016, at 09:06 AM, Jordan Pittier wrote:
> On Mon, Aug 29, 2016 at 8:50 AM, Zhenyu Zheng
> <zhengzhenyulixi at gmail.com> wrote:
>> Hi, all
>> Currently we have customer demands about adding parameter
>> "volume_type" to --block-device to provide the support of specified
>> storage backend to boot instance. And I find one newly drafted
>> Blueprint that aiming to address the same feature:
>> https://blueprints.launchpad.net/nova/+spec/support-boot-instance-set-store-type
>> ;
>> As I know this is kind of "proxy" feature for cinder and we don't
>> like it in general, but as the boot from volume functional was
>> already there, so maybe it is OK to support another parameter?
>> So, my question is that what are your opinions about this in general?
>> Do you like it or it will not be able to got approved at all?
>> Thanks,
>> Kevin Zheng
> Hi,
> I think it's not a great idea. Not only for the reason you mention,
> but also because the "nova boot" command is already way to complicated
> with way to many options. IMO we should only add support for new
> features, not "features" we can have by other means, just for
> convenience.

I completely agree with this. However I have some memory of us
saying(in Austin?) that adding volume_type would be acceptable since
it's a clear oversight in the list of parameters for specifying a block
device. So while I greatly dislike Nova creating volumes and would
rather users pass in pre-created volume ids I would support adding this
parameter. I do not support continuing to add parameters if Cinder adds
parameters though.

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