On Fri, May 23, 2014 at 10:19 AM, Udara Liyanage <[email protected]>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 > <[email protected]>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 < >> [email protected]> wrote: >> >>> >>> >>> >>> On Thu, May 22, 2014 at 11:33 PM, Ruzicka, Marek < >>> [email protected]> wrote: >>> >>>> Can’t help you here… I’m still running Grizzly, and volume resize came >>>> in IceHouse I believe. >>>> >>>> >>>> >>>> Marek >>>> >>>> >>>> >>>> >>>> >>>> *From:* Udara Liyanage [mailto:[email protected]] >>>> *Sent:* 23. mája 2014 07:28 >>>> *To:* Ruzicka, Marek >>>> *Cc:* [email protected] >>>> *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, <[email protected]> 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:[email protected]] >>>> *Sent:* 23. mája 2014 07:00 >>>> *To:* [email protected] >>>> *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 : [email protected] >>>> 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 >
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