Cloud IT infrastructure spending to reach $33.4 billion in 2015: IDC

Overall, spending on cloud IT infrastructure will grow by 26.4 percent, with public clouds showing the largest growth trajectory.

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Cloud spending now accounts for a third of all IT infrastructure spending, according to the latest research from analyst firm IDC, which lumps together data for server, storage, and Ethernet switch figures.

Overall, spending on cloud IT infrastructure will grow by 26.4 percent to reach $33.4 billion. In comparison, IDC says spending on non-cloud IT infrastructure will remain flat at $67 billion.

Infrastructure spending for public cloud shows the most impressive trajectory, with the potential to expand by 32.2 percent in 2015 to the range of $21.7 billion.

Private cloud is roughly half that, with spend expected to grow 16.8 percent year-over-year to $11.7 billion.

In most regions, growth in public cloud IT infrastructure spending will trump spending on private cloud IT infrastructure, as public cloud service providers push out better service offerings and invest in datacenter expansion.

The research firm last week released sales figures for the same cloud IT infrastructure market, and the numbers are fairly in line with today's report. IDC said the entire cloud IT infrastructure market grew by 25.1 percent during the first quarter of 2015, with sales worth $6.27 billion.

"Cloud IT infrastructure growth continues to outpace the growth of the overall IT infrastructure market, driven by the transition of workloads onto cloud-based platforms," said Kuba Stolarski, IDC research manager for server, virtualisation and workload research at IDC.

Top vendors for the quarter were HP, Dell, Cisco and EMC, which all reported a large uptick in sales. HP's sales rose 37.4 percent to $985 million, giving its market share a nearly 16 percent boost, while second place Dell took 11.9 percent of the market. Cisco came in with 9.3 percent and EMC 7.2 percent to round out the top five.