[one-users] persistent vs. non persistent

[Gerard Bernabeu]

Kenneth, if you use qcow2 copy-on-write with a preplaced or shared base 
image, non-persistent VMs will be as fast as persistent ones with shared TM.

Gerard Bernabeu
FermiCloud and FermiGrid Services at Fermilab
Phone (+1) 630-840-6509

On 09/03/2013 08:41 AM, Carlos Martín Sánchez wrote:
> Hi,
>
> As you said, the main difference is that persistent Images will retain 
> the changes made when the VM is shutdown. Because of this, persistent 
> Images can only be used by one VM at a time, while non-persistent ones 
> can be used by several VMs.
>
> A persistent Image will have a faster deploying time (prolog phase), 
> depending on your storage configuration [1]. For example, for the 
> shared TM the deployment will be immediate [2], whereas for the shared 
> TM the deployment time will be the same [3].
>
> Regards
>
> [1] http://opennebula.org/documentation:rel4.2:sm
> [2] 
> http://opennebula.org/documentation:rel4.2:fs_ds#persistent_non_persistent_images
> [3] 
> http://opennebula.org/documentation:rel4.2:fs_ds#persistent_non_persistent_images1
>
> --
> Join us at OpenNebulaConf2013 <http://opennebulaconf.com> in Berlin, 
> 24-26 September, 2013
> -- 
> Carlos Martín, MSc
> Project Engineer
> OpenNebula - The Open-source Solution for Data Center Virtualization
> www.OpenNebula.org <http://www.OpenNebula.org> | 
> cmartin at opennebula.org <mailto:cmartin at opennebula.org> | @OpenNebula 
> <http://twitter.com/opennebula>
>
>
> On Tue, Sep 3, 2013 at 10:04 AM, Kenneth <kenneth at apolloglobal.net 
> <mailto:kenneth at apolloglobal.net>> wrote:
>
>     What the difference between non persistent and persistent image?
>
>     - are the changes not saved on a non persistent image?
>
>     - is one faster than the other?
>
>     -- 
>     Thanks,
>     Kenneth
>
>
>     _______________________________________________
>     Users mailing list
>     Users at lists.opennebula.org <mailto:Users at lists.opennebula.org>
>     http://lists.opennebula.org/listinfo.cgi/users-opennebula.org
>
>
>
>
> _______________________________________________
> Users mailing list
> Users at lists.opennebula.org
> http://lists.opennebula.org/listinfo.cgi/users-opennebula.org

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.opennebula.org/pipermail/users-opennebula.org/attachments/20130903/903ff373/attachment-0002.htm>