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How can you tell if a Windows server has been upgraded in the past? 

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For example, you should not upgrade your Web servers if customers experience most delays in the database server or load balancer.
During the upgrade process, non-repairable components can be upgraded only by replacement (if necessary), while repairable ones may be imperfectly upgraded with various degrees.
Proceedings ArticleDOI
Nachiappan Nagappan, Thomas Ball 
15 May 2005
811 Citations
A case study performed on Windows Server 2003 indicates the validity of the relative code churn measures as early indicators of system defect density.
In order to compensate the degradation in the quality of service, the server needs to be upgraded with additional resources, mainly processors and memory.
Open accessProceedings ArticleDOI
N. Feske, Hermann Härtig 
03 Dec 2003
28 Citations
A window server used in real-time applications should be able to assure previously agreed-upon redrawing rates for a subset of windows while providing best-effort services to the remaining windows and operations such as moving windows.
Thus, although client/server is being touted as a radical change in information technology, practitioners need not discard the lessons from the past.
Open accessProceedings ArticleDOI
David Lo, Siau-Cheng Khoo, Chao Liu 
21 Jul 2008
48 Citations
Experiments on traces of JBoss Application Server shows the utility of our approach in inferring interesting past-time temporal rules.
If hardware replacement is allowed, these methods can be leveraged to further improve the upgraded systems.

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