According to the International Data Corporation (International Data Center) Worldwide Quarterly Enterprise Infrastructure Tracker: Buyers and Cloud DeploymentsIn the third quarter of 2021 (Q3 2021), spending on compute and storage infrastructure products for cloud infrastructure, including dedicated and shared environments, increased 6.6% year over year to $18.6 billion. The increase resumed a trend of quarterly net positive year-over-year spending growth, which was paused in the second quarter of 2021, when spending fell 1.9%. This follows seven quarters of year-over-year spending growth beginning in the third quarter of 2019, which highlighted a 38.4% increase in the second quarter of 2020, as the first wave of the global pandemic led to business and country closures, leading to increased demand for cloud services and Investment in infrastructure has surged. Investment in non-cloud infrastructure rose 7.3% year over year to $14.6 billion in the third quarter of 2021, marking the third consecutive quarter of year-over-year growth after a period of spending declines that began in the second quarter of 2019.
Shared cloud infrastructure spending reached $13 billion, up 8.6% from the third quarter of 2020 and up 6.6% from the previous quarter. This continues the year-over-year growth trend since Q4 2019, which was interrupted in the previous quarter (Q2 2021), and was exceptionally strong in Q2 2020, with surging demand for public cloud services in the first months of 2019 driving spending A 55.1% increase in epidemics. IDC expects that demand for shared cloud infrastructure will continue to be strong, with spending exceeding non-cloud infrastructure spending by 2022. Private cloud infrastructure spending grew 13.4% year over year to $5.6 billion in 3Q21, the highest year-over-year increase since Q1 2019, of which 45.5% was deployed on customer premises. IDC expects cloud environment spending to continue to outpace non-cloud spending throughout the forecast period.
For full-year 2021, IDC forecasts cloud infrastructure spending to grow 8.3% from 2020 to $71.8 billion, while non-cloud infrastructure is expected to grow 1.9% to $58.4 billion after two years of decline. Shared cloud infrastructure is expected to grow 7.2% year over year to $49.7 billion for the full year. Full-year spending on dedicated cloud infrastructure is expected to grow 10.7% to $22.2 billion.
As part of the tracker, IDC tracks different categories of service providers and how much computing and storage infrastructure, both cloud and non-cloud, are purchased by those service providers. Service provider categories include cloud service providers, digital service providers, communication service providers,…