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Il 06/09/11 07:59, GiBu GeorGe ha scritto:
<blockquote
cite="mid:CAED273-p+7xNh5sfXRZp5w+0R608Y7pgHA-yWfbZvLO_Uiyvtg@mail.gmail.com"
type="cite">Hai...<br>
<br>
My primary language is not english so i am having difficluty in
understanding Persistent image concept.. <br>
<br>
What i am trying to do is port my existing servers to opennebula..
But i want those vm to act as virtual machine normally would...
Means if any changes made to it wont disappear if the server
restart(physical/logical).. Does making it persisatant help with
that option... Or i am getting it all wrong here..<br>
<br>
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</blockquote>
When you restart a VM (with restart command) you don't loose
anything. The same using for example onevm xxx stop.<br>
At the moment there isn't an OpenNebula command to phisically
restart a VM (like unplug/plug the cable in a physical server) and
you have to do this in hypervisor (for example in xen with xm
destroy xxx/xm create xxx): with this operation you don't loose
anything.<br>
<br>
When you shutdown a VM in OpenNebula you delete disks that are not
persistent (and then it's correct: persistent images are disk that
survive when you shutdown a VM in OpenNebula), but this operation is
like a deletion of a VM, not a simple restart!<br>
<br>
The phylosophy on a cloud is a little different than a simple
virtualization system like VMWare: is to have non persistent
"golden" disk images with only S.O. and minimal configuration that
can be cloned to reach the maximum speed when you create a new VM;
think this disk like a read only disk. Then, in case, there is a
second persistent disk with persistent data.<br>
For example you can create a VM with a distro like FreeNAS in the
non persistent disk that export via NFS a persistent volume with you
web server pages.<br>
Then ther is a second VM with only a webserver configured that read
the web pages from FreeNAS. When you you reach the maximum load on
this VM, you can create a second webserver in a couple of seconds to
scale your application.<br>
<br>
Bye,<br>
Alberto<br>
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