Windows and Linux operating systems are getting an ever-growing share of data centre environments, as inexpensive x86 servers take over jobs once the domain of Unix operating systems, Gartner has said.
But Unix use remains core in datacentres, and while its revenue share is predicted to stay flat for the next five years, barely moving from $16.4bn (£7.9bn) this year to $16bn (£7.7bn) in 2012, Gartner analysts this week said users of major Unix systems from Sun Microsystems, IBM and Hewlett-Packard have nothing to worry about.
"Nobody is achieving great growth, but nobody is dying," said Gartner analyst John Enck, of the major Unix systems, adding that "there is stability."
Gartner, at its datacentre conference this week, said Windows is expected to get $19.6bn (£9.5bn) this year rising to $22.2bn (£10.7bn) by 2012. Linux, meanwhile, will grow from $8.6bn to $12.2bn over that same period.
"As a market, we want less complexity, we want fewer operating systems," said Enck.
Users will also continue to seek to simplify their environment, often by cutting back on the number of operating systems where possible. In an audience poll, the majority of attendees, 80%, were either reducing the number of supported operating systems or maintaining that number, with just one-fifth opting to add to their operating system mix.
Reducing the number of supported operating systems in a datacentre is easier said then done, said Frank Muller, senior director of IT technology and infrastructure support at HealthPartners, a health care provider, who was at the conference.
Muller said he supports AIX, Windows, Linux, a mainframe system and HPUX. When he asked the provider of one application that runs on HPUX to move it to AIX, the vendor complied. So far so good.
But a year and half later, Muller said he ended up moving the application back to HPUX because he couldn't get the vendor's long-term support for keeping the application on AIX. "If the vendor isn't there from an application point of view, I don't think you will make much headway," he said.
The total server operating systems is worth just over $54bn ( this year, with $9.5bn in the category of "other" encompassing all the other operating systems such as OpenVMS, mainframe operating systems and other Unix systems, Gartner said.