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https://issues.apache.org/jira/browse/CLOUDSTACK-10323?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16439483#comment-16439483
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ASF GitHub Bot commented on CLOUDSTACK-10323:
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rafaelweingartner commented on issue #2486: [CLOUDSTACK-10323] Allow changing 
disk offering during volume migration 
URL: https://github.com/apache/cloudstack/pull/2486#issuecomment-381610781
 
 
   @nitin-maharana are you LGTM here?

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> Change disk offering when volume is migrated to different type of storage 
> pool.
> -------------------------------------------------------------------------------
>
>                 Key: CLOUDSTACK-10323
>                 URL: https://issues.apache.org/jira/browse/CLOUDSTACK-10323
>             Project: CloudStack
>          Issue Type: Improvement
>      Security Level: Public(Anyone can view this level - this is the 
> default.) 
>    Affects Versions: 4.12
>            Reporter: Rafael Weingärtner
>            Assignee: Rafael Weingärtner
>            Priority: Major
>
> This is a continuation of work developed on PR #2425 (CLOUDSTACK-10240), 
> which provided root admins an override mechanism to move volumes between 
> storage systems types (local/shared) even when the disk offering would not 
> allow such operation. To complete the work, we will now provide a way for 
> administrators to enter a new disk offering that can reflect the new 
> placement of the volume. We will add an extra parameter to allow the root 
> admin inform a new disk offering for the volume. Therefore, when the volume 
> is being migrated, it will be possible to replace the disk offering to 
> reflect the new placement of the volume.
> The API method will have the following parameters: 
> * storageid (required)
> * volumeid (required)
> * livemigrate(optional)
> * newdiskofferingid (optional) – this is the new parameter
> The expected behavior is the following: 
> * If “newdiskofferingid” is not provided the current behavior is maintained. 
> Override mechanism will also keep working as we have seen so far. 
> * If the “newdiskofferingid” is provided by the admin, we will execute the 
> following checks
> ** new disk offering mode (local/shared) must match the target storage mode. 
> If it does not match, an exception will be thrown and the operator will 
> receive a message indicating the problem.
> ** we will check if the new disk offering tags match the target storage tags. 
> If it does not match, an exception will be thrown and the operator will 
> receive a message indicating the problem.
> ** check if the target storage has the capacity for the new volume. If it 
> does not have enough space, then an exception is thrown and the operator will 
> receive a message indicating the problem.
> ** check if the size of the volume is the same as the size of the new disk 
> offering. If it is not the same, we will ALLOW the change of the service 
> offering, and a warning message will be logged.
> We execute the change of the Disk offering as soon as the migration of the 
> volume finishes. Therefore, if an error happens during the migration and the 
> volume remains in the original storage system, the disk offering will keep 
> reflecting this situation



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