If you are talking about physically moving disks from one side of a cluster to another, then it depends on what kind of disk ownership you are using in your cluster. If it's HW ownership, then you would follow that KB article to a tee. If you hare using software ownership, instead powering everything down, you could simply re-assign those disks over to the other side of the cluster, then bring the aggregate back online when you're done.
If you are talking about logically moving them, you could use aggr copy, but that assumes you have disks on the other side to move the data and doesn't sound like what you want to do.
