One of most interesting inquiries I received last month from a Giga client was a question about key criteria for deciding between data warehousing on DB2/6000 and S/390. Here are the main points of the reply.
The greatest advantage of DB2 S/390 is in reliability, availability and serviceability. Although single image alternative platforms such as AIX- RS/6000 continue to improve, they are still not as bulletproof as the mainframe. Of course, there is a high availability cluster multiprocessing (HACMP) option (using a form of clustering) for AIX. That will at least partly address the reliability and availability issues. Notice also that the initial cost advantage of AIX is thereby reduced.
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