Hi John, Thanks for the excellent clarification.
On Fri, May 23, 2014 at 9:57 PM, John Griffith <john.griff...@solidfire.com>wrote: > > > > On Fri, May 23, 2014 at 10:19 AM, Udara Liyanage > <udaraliyan...@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 >> <udaraliyan...@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.griff...@solidfire.com> wrote: >>> >>>> >>>> >>>> >>>> On Thu, May 22, 2014 at 11:33 PM, Ruzicka, Marek < >>>> marek.ruzi...@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:udaraliyan...@gmail.com] >>>>> *Sent:* 23. mája 2014 07:28 >>>>> *To:* Ruzicka, Marek >>>>> *Cc:* openstack@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.ruzi...@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:udaraliyan...@gmail.com] >>>>> *Sent:* 23. mája 2014 07:00 >>>>> *To:* openstack@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@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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