[one-users] Best way to migrate datastores 0 & 1 to new storage area

Gerry O'Brien gerry at scss.tcd.ie
Mon Apr 22 06:33:06 PDT 2013

Hi Alex,

     Thanks for the interesting reply. We are running kvm/qemu so I'm 
not sure how this would work for us although we may use it in out Citrix 
infrastructure. I have a question: after the xNDB proxy is shutdown and 
restarted where does the cache get stored?

     In our OpenNebula installation, is it possible to switch system the 
datastore from 0 to some other datastore without interruption?


On 19/04/2013 14:50, Alexandre Bezroutchko wrote:
> On 04/18/2013 06:42 PM, Gerry O'Brien wrote:
>> Hi,
>>      We would like to migrate out installation to a new storage, so
>> that we can use ZFS instead of EXT4 for datastores 0 and 1. Are there
>> guidelines on how best to achieve this? If we just shut-down the
>> service it will take a long time to move existing files as they are
>> large so the disruption will be substantial.
> I would be interested to know a proper answer to this question too. To
> my knowledge such an operation would be outside of what Opennebula
> can/want to support, but you probably can achieve what you want with
> some trickery.
> If you can afford some downtime, you can try using the following
> approach to keep it to minimum:
> http://www.bouncybouncy.net/ramblings/posts/xen_live_migration_without_shared_storage.
> If you are looking for even shorted downtimes, there is another trick
> described here
> https://bitbucket.org/hirofuchi/xnbd/wiki/Home#!scenario-3-live-vm-disk-migration-with-xen.
> Note that the article's title suggests this is xen-specific, there are
> some kvm/qemu-specific information in the article.
> What hypervisor you use?
> Best regards,
> Alex
>>          Regards,
>>              Gerry
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Gerry O'Brien

Systems Manager
School of Computer Science and Statistics
Trinity College Dublin
Dublin 2

00 353 1 896 1341

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