Open Stack

Hi John,

Thanks for the excellent clarification.


On Fri, May 23, 2014 at 9:57 PM, John Griffith
<john.griffith at solidfire.com>wrote:

>
>
>
> 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
>>>>>
>>>>> _______________________________________________
>>>>> Mailing list:
>>>>> http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack
>>>>> Post to     : openstack at lists.openstack.org
>>>>> Unsubscribe :
>>>>> http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack
>>>>>
>>>>> ​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
>>
>
>


-- 
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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