A new survey by cloud software vendor Nutanix finds that most firms are embracing the hybrid model, but few have actually achieved it. And many are shifting their workloads back on premises because of cloud costs.\nThis was Nutanix\u2019s first global Enterprise Cloud Index, so it doesn\u2019t have historical data by which to measure, but its initial findings match what we\u2019ve known for a while.\u00a0\n\nThe hybrid cloud, a mix of on-premises and public cloud computing, working in tandem is the preferred method for most firms; 91 percent to be exact. But only 18 percent of firms surveyed said they have that model today. One reason is that app vendors make it hard to operate in hybrid mode, said Wendy Pfeiffer, CIO at Nutanix.\n\u201cThere\u2019s a lot of lock-in [that] vendors require, like ELAs [enterprise license agreements] or the proprietary nature of the architecture or environment,\u201d she said. \u201cThese natural things we want to do like portfolio management are very difficult because of flaws coded into the apps. There may not be evil intent on the part of vendors, but we still struggle with these licenses are how draconian these licenses are.\u201d\nInterest in hybrid, though, is growing, with 19 percent of companies surveyed using it now, which should rise to 26 percent in 12 months, and to 41 percent in 24 months.\nApplication mobility across any cloud is a top priority for 97 percent of respondents, with 88 percent saying it would \u201csolve a lot of my problems.\u201d Of course, that\u2019s one of the vendor lock-ins Pfeiffer talked about.\nCloud computing sticker shock\nAn interesting development is the return of apps from the cloud to on premises. Many companies that moved to the cloud to reduce costs got nasty sticker shock. The survey found that organizations that use public cloud spend 26 percent of their annual IT budget on public cloud computing, just 6 percent using public cloud came in under budget, and 35 percent overspent in their use of public cloud resources.\nWhy? It's because of the cost of reserved instances. Many apps start in the cloud in a virtualized instance like Amazon EC2, but once developed and running regularly, they need a more permanent home, especially if this is a high-scaling app. So, the customer moves to reserved instances, where more resources can be brought to play and the instance is permanent, not temporary.\nAnd while cloud service providers offer discounts up front, the costs still can add up fast and become unexpectedly expensive.\n\u201cPart of public cloud lifecycle is scaling apps move to reserved instances, which can be quite a bit pricier than public cloud,\u201d said Pfeiffer. \u201cIt\u2019s making that transition that catches IT unaware. Byte for byte, reserved instances are more expensive than an on prem data center.\u201d\nIt took a few years of living in the cloud for enterprises to finally get some historical data and compare cost models. Companies that moved entire CRM systems and associated systems to the public cloud found after a few years the savings were not there once they moved to reserved instance mode and began to move workloads back on premises.\n\u201cWhat I\u2019m seeing is owned data centers that were standing a little emptier than before are starting to fill back up again,\u201d said Pfeiffer.\nOwned data centers that were standing a little emptier than before are starting to fill back up again." \u2014 Wendy Pfeiffer, CIO, Nutanix\nAt the same time, data centers that were seeing reduced workloads are being modernized and becoming more efficient, such as using software-defined networks (SDN) to reduce networking costs. Pfeiffer also said the use of containers across multiple environments has become \u201chuge.\u201d\nAs workloads move back into private data centers, companies need to balance out their capex vs. the operating expenses of being in the cloud, particularly reserved instances.\n\u201cThe question becomes is it more cost effective for me to make those purchases and execute against my own capex and opex targets or more cost effective to pay those same fees to a service provider,\u201d said Pfeiffer.\nThe survey was conducted with 2,300 respondents from multiple industries, business sizes, and geographies in the Americas, Europe, the Middle East, Africa (EMEA), and Asia-Pacific and Japan (APJ) regions.