[one-users] persistent vs. non persistent

[Dmitri Chebotarov]

Hi

Even that your VM was destroyed after shutdown, the disk retains all the changes you made to the VM while it was running.
Next time you create a VM using this image, it will have all the changes you made.

If you just want to stop VM, don't use actions under Trash Bin icon – it will destroy your VM.
Use actions under Stop/Pause.

--
Thank you,

Dmitri Chebotarov
VCL Sys Eng, Engineering & Architectural Support, TSD - Ent Servers & Messaging
223 Aquia Building, Ffx, MSN: 1B5
Phone: (703) 993-6175 | Fax: (703) 993-3404


From: Lukman Fikri <lukman.fikri at outlook.com<mailto:lukman.fikri at outlook.com>>
Date: Tuesday, September 3, 2013 14:15
To: "users at lists.opennebula.org<mailto:users at lists.opennebula.org>" <users at lists.opennebula.org<mailto:users at lists.opennebula.org>>
Subject: Re: [one-users] persistent vs. non persistent

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<mailto:gerard1 at fnal.gov>
To: cmartin at opennebula.org<mailto:cmartin at opennebula.org>
CC: users at lists.opennebula.org<mailto: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

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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

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