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For the third year in a row, IBM AIX v7.1 UNIX operating system (OS) running on the company’s Power System servers scored the highest reliability ratings and recorded the least amount of overall downtime from Tier 1, Tier 2 and Tier 3 outages among 18 different server OS platforms.

Over three-quarters or 78% of survey respondents indicated they experienced less than one of the most prevalent, minor Tier 1 incidents per server, per annum on IBM’s AIX v. 5.3 and AIX v 7.1 distributions. An 83% majority of IBM AIX v 7.1 and Novell SUSE Enterprise Linux Server 11 and 82% of Windows Server 2008 R2 survey respondents indicated their organizations experienced less than one unplanned, severe/lengthy Tier 3 outage per server, per annum (See Exhibit 1).

Microsoft’s Windows Server 2008 R2 (which scored the biggest year-over-year reliability gains), and Novell’s SUSE Enterprise Linux Server 11 closely challenged IBM’s AIX v 7.1 server OS reliability and uptime – particularly with respect to the most severe and costly Tier 3 outages. Unplanned Tier 3 outages – whether manmade or as the result of a disaster — typically cause downtime in excess of four hours. There is widespread disruption of applications and network operations; customers and business partners are frequently impacted and Tier 3 incidents will almost always require remediation by a significant portion of the IT staff.

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