Amdahl's new generation GS800 mainframes are underperforming by up to 15 per cent on core workloads, such as DB2 and Cics.
As a result, the company may replace affected models with its next generation Millennium 2000s to ensure users get the promised performance.
Tony Whalley, communications manager with Amdahl, admitted some performance problems with the GS800s, shipping since December, but said that the majority of customers are satisfied. He said some customers, depending on workloads and applications stress, are experiencing single digit degradation in performance.
Tony Whalley declined to confirm that Amdahl will announce immediate availability of the new systems, as originally planned, but acknowledged that if such an announcement takes place, customers will have several choices. He denied reports that customers will face extra software charges as a result of the changes.
They may stay with the GS800 systems at reduced licensing costs; they can upgrade to the GS2000 system with an equal number of engines or they can upgrade and acquire additional engines. Any extra capacity acquired cannot exceed the initial bid price.
Phil Payne, Isham Research analyst, said: "Some workloads like DB2 and CICS are experiencing vicious levels of turbulence with the GS800s because of cache design...but Amdahl appears to be taking the appropriate actions to ensure that customers are not affected financially."
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