IBM Z is the family name IBM uses for its current line of z/Architecture mainframe computers, a 64 bit computing platform introduced in 2000 with the eServer zSeries 900 as the successor to System/390. IBM Z systems keep full backward compatibility, so that software written decades earlier for the 1964 System/360 can still run unmodified on current machines, and the most recent generations include the z17, z16, z15, z14 and z13, following earlier zEnterprise and System z9 and z10 lines. The z in the name stands for zero downtime, reflecting a design built around redundant components and hot failover, and the systems run IBM operating systems including z/OS, z/VM, z/VSE and z/TPF as well as Linux on IBM Z, commonly using mandatory hardware and hypervisor based virtualization to run many logical machines on one physical system.
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IBM System/390, Systems IBM Z (z/Architecture, introduced 2000) is the successor mainframe family to IBM System/390.
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1. Wikipedia: IBM Z
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Announced on October 3, 2000, and available on December 18, the eServer zSeries 900 (z900 for short) was the first to feature the 64-bit z/Architecture extension.
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