Measuring savings is difficult because agencies use different metrics to gauge the size of the data center or level of utilization. Some count the number of physical servers, others the amount and utilization of storage capacity, for example.
The most Catch-22 problem is that agencies already struggling with budget cuts and don't have money allocated for the consolidation.
However they define it, 82 percent of the data-center managers surveyed think they can hit the consolidation targets by 2015.
I'm guessing that number will stay about the same until sometime in mid-2014, then drop rapidly as federal data center managers and CIOs either realize or admit that closing 800 data centers without losing any of the work they're supposed to do, is a lot harder than even they thought it would be.