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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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> |
[email protected] <mailto:[email protected]> | @OpenNebula
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On Tue, Sep 3, 2013 at 10:04 AM, Kenneth <[email protected]
<mailto:[email protected]>> 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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