According to the International Data Corporation (IDC) Worldwide Quarterly Cloud IT Infrastructure Tracker, total cloud IT infrastructure spending (server, disk storage, and ethernet switch) will grow by 21% year over year to $32 billion in 2015, accounting for approximately 33% of all IT infrastructure spending, which will be up from about 28% in 2014. Private cloud IT infrastructure spending will grow by 16% year over year to $12 billion, while public cloud IT infrastructure spending will grow by 25% in 2015 to $21 billion. For the full year 2014, cloud IT infrastructure spending totaled $26.4 billion, up 18.7% year over year from $22.3 billion; private cloud spending was just under $10.0 billion, up 20.7% year over year, while public cloud spending was $16.5 billion, up 17.5% year over year.