In this tutorial I will show you how to repair a sparsebundle image. It's not difficult but it can take some time, depending of the size of your image.
Also, please do note that some images are so damaged that they cannot be repaired so do not throw stones at me if you cannot fix yours.
What I am showing you below is not hard at all but it needs extra attention and the steps must be followed accordingly.
First of all you must have the information regarding the assigned LUNS, either created by you or by the storage admin.
Once you have them, open 3 sessions: one to each VIO and another to the target partition. They will be referred below as gzv1, gzv2 and gzaix.
Let's assume you have your systems farm. From one of them you are able to connect to all others with ssh keys already configured.
Now, you create a list with all these systems in it. If you want to temporary skip one system, just put # in front of it, like in our example (server2 disabled).
The ssh options are there to assure you that even if you have ssh configuration problems or one server is down, you won't get stuck on that and everything will go smooth to the end.