I think you're talking about what DL would need to reach the "2/3 of the amount of claims" threshold. If so, from what I've seen im the media, the secured creditors represent about 1/2 the claims and will be presumed to be in favor of DL's POR. If the numbers I've seen are right, then DL effectively already has 3/6 of the claims value locked up and needs 4/6 to meet the 2/3 needed - so they need an additional 1/6 from the unsecured creditors.
One thing I've done is oversimplify somewhat. What the BK law says is that for each class of creditors, holders of over 2/3 of the claim value and over 1/2 of the claim holders must vote in favor of the plan for that class to be in favor of the plan. In a big DK like DL, there are 10-12 separate companies with each potentially having 10 or so classes of creditors (within the 2 broad catagories of secured/unsecured). The law makes it clear what is needed for a class of creditors to accept or reject the plan, but I haven't found how the class results are combined. So I've just been assuming that the "over 2/3 and over 1/2" applies to the entire creditor group.
Jim