Open Stack

On Fri, May 23, 2014 at 10:19 AM, Udara Liyanage <udaraliyanage at gmail.com>wrote:

> HI Beyh,
>
> According to the changes made in [1], volumes are not cleared when
> "volume_clear=none"
>
> [1]
> https://github.com/openstack/cinder/commit/bb06ebd0f6a75a6ba55a7c022de96a91e3750d20
>

​Exactly!!  That's the whole point :)​

>
>
>
> On Fri, May 23, 2014 at 9:46 PM, Udara Liyanage <udaraliyanage at gmail.com>wrote:
>
>> HI John,
>>
>> Thanks for the detailed answer.
>> Just one more clarification. If "lvm_type=thin" will it clear only the
>> blocks which data are written on?
>>
>>
>> On Fri, May 23, 2014 at 8:51 PM, John Griffith <
>> john.griffith at solidfire.com> wrote:
>>
>>>
>>>
>>>
>>> On Thu, May 22, 2014 at 11:33 PM, Ruzicka, Marek <
>>> marek.ruzicka at t-systems.sk> wrote:
>>>
>>>> Can’t help you here… I’m still running Grizzly, and volume resize came
>>>> in IceHouse I believe.
>>>>
>>>>
>>>>
>>>> Marek
>>>>
>>>>
>>>>
>>>>
>>>>
>>>> *From:* Udara Liyanage [mailto:udaraliyanage at gmail.com]
>>>> *Sent:* 23. mája 2014 07:28
>>>> *To:* Ruzicka, Marek
>>>> *Cc:* openstack at lists.openstack.org
>>>> *Subject:* Re: [Openstack] Large volume creation takes long time
>>>>
>>>>
>>>>
>>>> HI marek,
>>>>
>>>> Thanks for the reply.
>>>> By the way how to resize a volume to zero. I found "cinder extend"
>>>> command where volumes can be extended. How to shrink the volume to zero?
>>>>
>>>>
>>>>
>>>> On Fri, May 23, 2014 at 10:52 AM, <marek.ruzicka at t-systems.sk> wrote:
>>>>
>>>> I’m not 100% sure, but I remember (depending on the driver you are
>>>> using) it used to zero entire volume before deletion, which might or might
>>>> not make sense for you.
>>>>
>>>> Sorry for not being able to provide any details, this is just something
>>>> I remember from way back.
>>>>
>>>>
>>>>
>>>> Cheers,
>>>>
>>>> Marek
>>>>
>>>>
>>>>
>>>> *From:* Udara Liyanage [mailto:udaraliyanage at gmail.com]
>>>> *Sent:* 23. mája 2014 07:00
>>>> *To:* openstack at lists.openstack.org
>>>> *Subject:* [Openstack] Large volume creation takes long time
>>>>
>>>>
>>>>
>>>> Hi,
>>>>
>>>> When it tries to delete a large sized volume, it takes a long time. Is
>>>> there a another better way to do  this such as resizing a volume to zero.
>>>>
>>>>
>>>> --
>>>>
>>>> Udara S.S Liyanage.
>>>> Software Engineer at WSO2.
>>>> Commiter and PPMC Member of Apache Stratos.
>>>> Blog - http://udaraliyanage.wordpress.com
>>>>
>>>> phone: +94 71 443 6897
>>>>
>>>>
>>>>
>>>>
>>>> --
>>>>
>>>> Udara S.S Liyanage.
>>>> Software Engineer at WSO2.
>>>> Commiter and PPMC Member of Apache Stratos.
>>>> Blog - http://udaraliyanage.wordpress.com
>>>>
>>>> phone: +94 71 443 6897
>>>>
>>>> _______________________________________________
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>>>> Post to     : openstack at lists.openstack.org
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>>>>
>>>> ​The writing zeros to the volume on delete is indeed what you're
>>> seeing, it's a "feature" that is there for security purposes, so for
>>> example a public provider doesn't hand out a new volume to a tenant with
>>> the possibility of allocating blocks with somebody elses data on them.
>>>
>>> You can switch to using "lvm_type=thin" in your cinder.conf file which
>>> will basically handle this by returning zero for blocks that haven't been
>>> written yet (so we don't do the secure delete).  Or as was suggested if you
>>> don't need the secure delete option you can turn it off altogether by
>>> setting "volume_clear=none" in your cinder.conf file.
>>>
>>> As far as adjusting the size to zero, we don't allow reducing the volume
>>> size, only extending.  Reducing introduces quite a bit of risk and also it
>>> doesn't address the problem that secure_delete is there for anyway.
>>>
>>> Thanks,
>>> John​
>>>
>>>
>>
>>
>> --
>> Udara S.S Liyanage.
>> Software Engineer at WSO2.
>> Commiter and PPMC Member of Apache Stratos.
>> Blog - http://udaraliyanage.wordpress.com
>> phone: +94 71 443 6897
>>
>
>
>
> --
> Udara S.S Liyanage.
> Software Engineer at WSO2.
> Commiter and PPMC Member of Apache Stratos.
> Blog - http://udaraliyanage.wordpress.com
> phone: +94 71 443 6897
>
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