Hi,

I'll try to explain - I hope that I'll get it right :)

Lets say that you have a vm with one disk, and you create a snapshot - what it actually does is creating another disk and start writing to it from this point. Now lets say that you create another snapshot now - again, it'll create another disk and start writing to it.

Now if you want to remove the first snapshot, you need to merge the information that was written on this snapshot, so you won't loose data in the second snapshot.

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From: "Mohyedeen Nazzal" <mohyedeen.nazzal@gmail.com>
To: Users@ovirt.org
Sent: Sunday, May 25, 2014 9:40:57 AM
Subject: [ovirt-users] Removing Snapshot sub tasks

Greetings, 

When removing a snapshot, why does the following sub task is executed: 

• Merging snapshot of disk DiskNname ?
  

Attached a screenshot of the tasks executed. 

I'm just wondering why there is a need to perform merge ?  

Thanks, 

Mohyedeen

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