[one-users] persistent vs. non persistent

[Carlos Martín Sánchez]

Hi,

What storage configuration are you using? How did you shutdown your VMs?

Regards

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Carlos Martín, MSc
Project Engineer
OpenNebula - The Open-source Solution for Data Center Virtualization
www.OpenNebula.org | cmartin at opennebula.org |
@OpenNebula<http://twitter.com/opennebula><cmartin at opennebula.org>


On Tue, Sep 3, 2013 at 8:15 PM, Lukman Fikri <lukman.fikri at outlook.com>wrote:

> Hi,
>
> i already used persistent image setting, but why it didn't retain the
> changes made when the VM is shutdown?
> my VM was destroyed immediately after i shutdown it.
> So i used to suspend the VM rather than shutting down it.
>
> Thank you,
> -Lukman
>
> ------------------------------
> Date: Tue, 3 Sep 2013 10:16:08 -0500
> From: gerard1 at fnal.gov
> To: cmartin at opennebula.org
> CC: users at lists.opennebula.org
> Subject: Re: [one-users] persistent vs. non persistent
>
>
> 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 | cmartin at opennebula.org | @OpenNebula<http://twitter.com/opennebula>
>
>
> On Tue, Sep 3, 2013 at 10:04 AM, Kenneth <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
>
>
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