According to the IDC Worldwide Quarterly Cloud IT Infrastructure Tracker, vendor revenue from sales of infrastructure products (server, storage, and Ethernet switch) for cloud IT, including public and private cloud, grew 27.3% year over year in the fourth quarter of 2017), reaching $12.8 billion. For the full year 2017, the combined public and private cloud deployments continued the double-digit annual growth trend from past years with revenues reaching $43.4 billion for 21.7% year-over-year growth.
Public cloud infrastructure revenue has almost doubled in the past two years to $8.5 billion, growing 34.0% year over year in 4Q17. Private cloud revenue reached $4.3 billion for an annual increase of 15.7%. Total worldwide cloud IT infrastructure revenue in 2017 more than doubled when compared to 2013. The combined public and private cloud revenues now represent 42.2% of the total worldwide IT infrastructure spending, up from 39.3% a year ago. Traditional (non-cloud) IT infrastructure revenue grew 12.8% from a year ago, although it has been generally declining over the past several years; at $17.5 billion in 4Q17 it still represents 57.8% of total worldwide IT infrastructure spending.