IBM System z, or earlier IBM eServer zSeries, is a brand name designated by IBM to all its mainframe computers.
In 2000, IBM rebranded the existing System/390 to IBM eServer zSeries with the e depicted in IBM's red trademarked symbol, but because no specific machine names were changed for System/390, the zSeries in common use refers only to one generation of mainframes, starting with z900.
Since April 2006, with another generation of products, th...
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IBM System z, or earlier IBM eServer zSeries, is a brand name designated by IBM to all its mainframe computers.
In 2000, IBM rebranded the existing System/390 to IBM eServer zSeries with the e depicted in IBM's red trademarked symbol, but because no specific machine names were changed for System/390, the zSeries in common use refers only to one generation of mainframes, starting with z900.
Since April 2006, with another generation of products, the official designation has changed to IBM System z, which now includes both older IBM eServer zSeries, the IBM System z9 models, and the newer IBM System z10 models.
Both zSeries and System z brands are named for their availability — z stands for zero downtime. The systems are built with spare components capable of hot failovers to ensure continuous operations.
The zSeries line succeeded the System/390 line (S/390 for short), maintaining full backward compatibility. In effect, zSeries machines are the direct, lineal descendants of System/360,...
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