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Windows Server and Linux are growing up fast, but they still aren't a match for the solid, stable Unix systems on the high-end of the server scale.
That's the conclusion of a report from The Yankee Group, which released it 2006 Global Server Reliability Survey on Wednesday. The report compared a number of server operating systems in areas of reliability, down time and recovery.
It found that Windows Server 2003 showed the highest reliability gains, surpassed only by mature Unix-based server operating systems like HP-UX from Hewlett-Packard (Quote, Chart) and Sun Solaris 10 from Sun Microsystems (Quote, Chart).
The Yankee Group found that corporate Linux, Windows and Unix servers experience on average three to five failures per server per year, resulting in 10.0 to 19.5 hours of annual downtime for each server. The down time for Linux systems was longer not due to a software failure, but because Linux often isn't as well-known or that well documented.
"One of the reasons for extended down time often had nothing to do with performance and reliability of the OS," said Laura DiDio, research fellow for application infrastructure and software platforms at The Yankee Group.
"The one random element I can't emphasize enough is I think some of the disparity we see between Red Hat Linux down time and Windows and Unix comes not so much from any inherent flaws in the Linux core kernel, but the unfamiliarity of some of the network administrators with Linux."
When a Linux system fails, it can sometime send a Linux administrator, who likely has less years of experience than a Sun or IBM Unix veteran, scouring the Internet for documentation or a fix.
Overall, DiDio said, all of the server operating system environments have shown markedly improved reliability in recent years, both in hardware and software. The improvements in hardware from Dell, HP and other vendors has given the operating systems a better base on which to run.