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https://issues.apache.org/jira/browse/CLOUDSTACK-9539?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15604463#comment-15604463
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ASF GitHub Bot commented on CLOUDSTACK-9539:
--------------------------------------------

Github user koushik-das commented on a diff in the pull request:

    https://github.com/apache/cloudstack/pull/1727#discussion_r84839712
  
    --- Diff: 
engine/storage/snapshot/src/org/apache/cloudstack/storage/vmsnapshot/DefaultVMSnapshotStrategy.java
 ---
    @@ -128,7 +128,7 @@ public VMSnapshot takeVMSnapshot(VMSnapshot vmSnapshot) 
{
                 if (options != null)
                     quiescevm = options.needQuiesceVM();
                 VMSnapshotTO target =
    -                new VMSnapshotTO(vmSnapshot.getId(), vmSnapshot.getName(), 
vmSnapshot.getType(), null, vmSnapshot.getDescription(), false, current, 
quiescevm);
    +                new VMSnapshotTO(vmSnapshot.getId(), vmSnapshot.getName(), 
vmSnapshot.getType(), null, vmSnapshot.getDescription(), false, current, 
quiescevm, userVm.getServiceOfferingId());
    --- End diff --
    
    Storing the service offering in DB along with vm snapshot entry should be 
sufficient, don't see any reason to put it in TO object.


> Support changing Service offering for instance with VM Snapshots
> ----------------------------------------------------------------
>
>                 Key: CLOUDSTACK-9539
>                 URL: https://issues.apache.org/jira/browse/CLOUDSTACK-9539
>             Project: CloudStack
>          Issue Type: Bug
>      Security Level: Public(Anyone can view this level - this is the 
> default.) 
>            Reporter: Nicolas Vazquez
>            Assignee: Nicolas Vazquez
>
> h3. Actual behaviour
> CloudStack doesn't support changing service offering for vm instances which 
> have vm snapshots, they should be removed before changing service offering.
> h3. Goal
> Extend actual behaviour by supporting changing service offering for vms which 
> have vm snapshots. In that case, previously taken snapshots (if reverted) 
> should use previous service offering, future snapshots should use the newest.
> h3. Proposed solution:
> 1. Adding {{service_offering_id}} column on {{vm_snapshots}} table: This way 
> snapshot can be reverted to original state even though service offering can 
> be changed for vm instance.
> NOTE: Existing vm snapshots are populated on update script by {{UPDATE 
> vm_snapshots s JOIN vm_instance v ON v.id = s.vm_id SET s.service_offering_id 
> = v.service_offering_id;}}
> 2. New vm snapshots will use instance vm service offering id as 
> {{service_offering_id}}
> 3. Revert to vm snapshots should use vm snapshot's {{service_offering_id}} 
> value.
> h3. Example use case:
> - Deploy vm using service offering A
> - Take vm snapshot -> snap1 (service offering A)
> - Stop vm
> - Change vm service offering to B
> - Revert to VM snapshot snap 1
> - Start vm
> It is expected that vm has service offering A after last step



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