Open Stack

Hi Avishay,

Thanks for such a nice clarification on the whole subject.

On Wed, Jun 17, 2015 at 10:43 AM, Avishay Traeger <avishay at stratoscale.com>
wrote:

> Short answer: no :-)
>
> Long answer:
> Cinder reports the provisioned size, and not the physical size, for both
> volumes and snapshots.  For example, when you create the volume, the
> storage may not allocate any physical space if it does lazy allocation, but
> the size reported is still 1GB and it uses 1GB of quota.  Similarly, the
> snapshot is 1GB of provisioned space and uses 1GB of quota, even though it
> uses close to zero physical space.  This is because quotas in Cinder refer
> to provisioned capacity, not physical.
>
> In my opinion this is what most/all providers want.  They want to limit
> the amount a user can provision, and hide the physical properties of the
> storage.  In fact, Cinder doesn't even know about the physical capacity of
> each volume and snapshot, and many storage systems don't even know how to
> calculate that information accurately (after thin provisioning, dedup,
> compression, etc.).
>
>
>
> On Tue, Jun 16, 2015 at 10:36 AM, Abhishek Shrivastava <
> abhishek at cloudbyte.com> wrote:
>
>> Hi Folks,
>>
>> I am using DevStack Master setup and created a 1 GB volume using its
>> Horizon. But while creating its snapshot I found out that it is taking the
>> same size as that of volume(i.e; 1 GB).
>>
>> However, I am using a third-party cinder driver whose snapshot's are COW
>> based which consumes only the block diff as its size. But in OpenStack the
>> snapshot uses the same size as that of volume which eventually leads to
>> QUOTA Exceed errors.
>>
>> I would like to know if there is any way to set the OpenStack snapshot
>> size equal to the backend storage's snapshot size?
>>
>> --
>>
>>
>> *Thanks & Regards,*
>> *Abhishek*
>> *Cloudbyte Inc. <http://www.cloudbyte.com>*
>>
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>>
>
>
> --
> *Avishay Traeger*
> *Storage R&D*
>
> Mobile: +972 54 447 1475
> E-mail: avishay at stratoscale.com
>
>
>
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>



-- 


*Thanks & Regards,*
*Abhishek*
*Cloudbyte Inc. <http://www.cloudbyte.com>*
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