Enterprise spending on cloud computing growing at a faster rate than overall IT spending, Gartner cloud forecaster Ed Anderson believes.

Cloud computing is forecast to grow 19 per cent in 2012, becoming a $109bn industry, up from $91bn last year.

In the next four years, it's expected to nearly double to $207bn, according to Anderson's latest findings.

That compares to the 3 per cent growth expected in the overall global IT market.

The hottest five investments cloud services in the coming year will be:

 - infrastructure as a service (IaaS), which is expected to grow by 41 per cent
 - Management and security is expected to rise 27.2 per cent
 - Platform as a service rising 26.6 per cent
 - SaaS  up 17.4 per cent
 - Business process as a service up 15 per cent

The cloud industry has a long way to go, as it only represents a 3 per cent chunk of the overall $3.6tr spent on IT globally.

In the long term, Anderson says, the cloud model will create new IT spending opportunities. Integration, customisation, hybrid cloud and on-premise cloud installations will all grow as investment channels as cloud adoption continues.

"There will be some short-term decline, but in the long term, it will level out," he says.

Meanwhile, computing hardware sales are expected to rise only 3.4 per cent this year to $420 bn, which compares to 7.4 per cent growth in 2011.

Enterprise software, after increasing 9.8 per cent in the same period, is expected to reach $281bn this year, a 4.3 per cent rise.