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I agree with you extend might be one way to solve the problem.

By the way, How about another way that we could import volume
size with float value? such as: 2.5G, 3.4G?

Did community consider about it in the begin?


2017-04-07 20:16 GMT+08:00 Duncan Thomas <duncan.thomas at gmail.com>:

> Cinder will store the volume as 1G in the database (and quota) even if
> the volume is only 500M. It will stay as 500M when it is attached
> though. It's a side effect of importing volumes, but that's usually a
> pretty uncommon thing to do, so shouldn't affect many people or cause
> a huge amount of trouble.
>
> There are also backends that allocate in units greater than 1G, and so
> sometimes give you slightly bigger volumes than you asked for. Cinder
> doesn't not go out if its way to support this; again the database and
> quota will reflect what you asked for, the attached volume will be a
> slightly different size.
>
> In your case, extend might be one way to solve the problem, if you
> backend supports it. I'm not certain what will happen if you ask
> cinder to extend to 1G a volume it already thinks is 1G... if it
> doesn't work, please file a bug.
>
> On 7 April 2017 at 09:01, jun zhong <jun.zhongjun2 at gmail.com> wrote:
> > Hi guys,
> >
> > We know the share's size unit is in gigabiyte in manila, and volume's
> size
> > unit is also in gigabiyte in cinder, But there is a question that the
> size
> > is not exactly after we migrate tradition enviroment to OpenStack.
> > For example:
> > 1.There is original volume(vol_1) with 500MB size in tradition enviroment
> > 2.We want to use openstack to manage this volume(vol_1)
> > 3.We can only use 1GB volume to manage the original volume(vol_1),
> because
> > the cinder volume size can not support 500MB.
> > How to deal with this? Could we set the volume or share's unit to float
> or
> > something else? or add new unit MB? or just extend the original volume
> size?
> >
> >
> > Thanks
> > jun
> >
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>
>
> --
> Duncan Thomas
>
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